Jiri Hospodka - Academia.edu (original) (raw)

Papers by Jiri Hospodka

Research paper thumbnail of High‐speed adaptive analog filter based on fully analog artificial neural network

International Journal of Circuit Theory and Applications, Jul 10, 2023

Research paper thumbnail of Symbolic and semisymbolic analysis of electronic circuit in maple

International Conference on Circuits, Jul 14, 2011

This paper presents a usage of Maple program for electric and electronic circuit analysis. The sp... more This paper presents a usage of Maple program for electric and electronic circuit analysis. The special package PraCAn has been used for this purpose. This contribution introduces possibilities of the package for circuit linearization and following ac symbolic or semisymbolic analyses. Simplification of the active part models is done by their instance parameters to obtain useful results for dominant circuit behavior. This is demonstrated on elementary examples of electronic circuit analysis. The package was developed at the Department of Circuit Theory, CTU for research and teaching support.

Research paper thumbnail of Application for symbolic analysis of linear circuits including switched circuits

International Conference on System Science and Simulation in Engineering, Nov 21, 2007

This paper presents a tool for symbolic analysis of electronic circuits-continuous-time circuits ... more This paper presents a tool for symbolic analysis of electronic circuits-continuous-time circuits and periodically switched linear (PSL) circuits. Applied method of analysis is based on modeling of periodically switched networks by mixed s, z description. The method is implemented in program Maple TM in the form of Maple package named PraSCAn. Current version of the package provides all basic analysis of linear continuoustime circuits as well as of multiphase PSL circuits. The paper presents time domain analysis of idealized switched circuits in more detail. Described algorithm uses closed-form solution in time domain for continuous time which is implemented in the package. A system of www interface based on PraSCAn package for electronic circuit analysis via internet is presented in the next part of the article. Some results are shown in the end of the paper.

Research paper thumbnail of Description of the functional blocks for the cross-coupled charge pump design algorithm

This paper presents the circuit model that is used for the cross-coupled charge pump design algor... more This paper presents the circuit model that is used for the cross-coupled charge pump design algorithm. Symbolic description of the pump stage model as an analog functional block for high-voltage application is firstly discussed. Design process has been done by using simplified BSIM model equations assuming the long channel MOSFET. Characteristics have been verified by ELDO Spice and compared with the found relationships. Static and dynamic parameters of the subcircuit have been tested in two-stages structure by LT Spice simulator. Analysis results show the consistency between model and real circuits characteristics under given conditions. Complex model provides the reliable results for significantly smaller strange capacitances in comparision with the main pump capacitances. The model can be used for design and prediction of the pump parameters without long-time simulation process. The strong inversion region of MOSFET is expected, thus equations are correct for other MOSFET models that are used in chip design (PSP).

Research paper thumbnail of Special web-based application for electric circuit analysis

This paper presents special web-based application for analysis of electric and electronic circuit... more This paper presents special web-based application for analysis of electric and electronic circuit with administration interface. The application is based on PHP scripts and Maple with PraCAn package as a computation engine. Continuous-time linear circuits can be inserted to application database by administrator and then analyzed by users through internet. Results can be obtained in symbolic as well as semisymbolic form. The graphical interface used to display results is based on Javascript libraries and runs on user side in user browser. The whole system is developed at the Department of Circuit Theory.

Research paper thumbnail of Filters Design by Z Transformation and Pascal Matrix

In the context of the digital filter design, a great deal of research has been done to facilitate... more In the context of the digital filter design, a great deal of research has been done to facilitate their computation. The Pascal matrix defined in [1], [2] has provided its utility in this field. In this paper we summarize the direct transformation from low-pass continuous-time transfer function H(s) to discrete-time H(z) of the bandpass and bandstop transfer functions. This algorithm uses the Pascal matrix and is constructed from the rows of a Pascal triangle. The advantage of this method is that the inverse transformation is obtained with the Pascal matrix without computing the determinant of the system, which simplifies the process to obtain the associated analog transfer function H(s) if the discrete transfer function H(z) is known. Numerical example for matrices P, P1, Q and Q1 illustrate the practical utilization of this technique.

Research paper thumbnail of New Method for Measuring of Natural Frequency of Tensometrical String Sensors

ABSTRACT This page presents new method for exiting string tensometrical sensors for mechanical te... more ABSTRACT This page presents new method for exiting string tensometrical sensors for mechanical tense measurement. This method is based on the synchronized discrete exciting of the string and measuring the string oscillations. The main requirement was self-acting function of the whole system without an external exciting and controlling. The method has been verified on a functional sample.

Research paper thumbnail of Switched-current filter optimization based on evolutionary algorithms

ABSTRACT This paper describes a way to eliminate the effect of circuit nonidealities on the magni... more ABSTRACT This paper describes a way to eliminate the effect of circuit nonidealities on the magnitude frequency response of a circuit utilizing the switched-current technique. The circuit realizes a band-pass filter. The elimination is carried out by optimization based on one of evolutionary algorithms - the differential evolution. The nonidealities are nonzero on-state resistance of the switches and nonzero output conductance of the field-effect transistors implementing the current sources. It is shown that the filter with the current source transconductance values designed according to a common method for ideal components has a significantly different magnitude frequency response when the nonidealities are considered. Hence, the optimization is applied to finding suitable transconductance values so that the difference between the magnitude frequency responses of the ideal and nonideal filter is minimized.

Research paper thumbnail of Ways to Optimize Analogue Switched Circuits

DOAJ (DOAJ: Directory of Open Access Journals), Dec 1, 2008

This paper describes how analogue switched circuits (switched-capacitor and switched-current circ... more This paper describes how analogue switched circuits (switched-capacitor and switched-current circuits) can be optimized by means of a personal computer. The optimization of this kind of circuits is not so common and their analysis is more difficult in comparison with continuously working circuits. Firstly, the nonidealities occurring in these circuits whose effect on their characteristics should be optimized are discussed. Then a few ways to analyze analogue switched circuits are shown. From all optimization algorithms applicable for this kind of optimization, two ones that seem to be the most promising are proposed. The differential evolution (one of evolutionary algorithms) combined with the simplex method was found to be most appropriate from these two ones. Two types of programs are required for the optimization of these circuits: a program for implementing calculations of the used optimization algorithm and a program for the analysis of the optimized circuit. Several suitable computer programs from both of the groups together with their proper settings according to authors' experience are proposed. At the end of the paper, an example of a switched-current circuit optimization documenting the previous description is presented.

Research paper thumbnail of Implementation of a Two-Channel Maximally Decimated Filter Bank using Switched Capacitor Circuits

DOAJ (DOAJ: Directory of Open Access Journals), Apr 1, 2013

The aim of this paper is to describe the implementation of a two-channel filter bank (FB) using t... more The aim of this paper is to describe the implementation of a two-channel filter bank (FB) using the switched capacitor (SC) technique considering real properties of operational amplifiers (OpAmps). The design procedure is presented and key recommendations for the implementation are given. The implementation procedure describes the design of two-channel filter bank using an IIR Cauer filter, conversion of IIR into the SC filters and the final implementation of the SC filters. The whole design and an SC circuit implementation is performed by a PraCAn package in Maple. To verify the whole filter bank, resulting real property circuit structures are completely simulated by WinSpice and ELDO simulators. The results confirm that perfect reconstruction conditions can be almost accepted for the filter bank implemented by the SC circuits. The phase response of the SC filter bank is not strictly linear due to the IIR filters. However, the final ripple of a magnitude frequency response in the passband is almost constant, app. 0.5 dB for a real circuit analysis.

Research paper thumbnail of Optimization methods for switched capacitor circuits

International Conference on Applied Electronics, Sep 1, 2015

The paper investigates the performance of the Differential Evolution (DE) and Particle Swarm Opti... more The paper investigates the performance of the Differential Evolution (DE) and Particle Swarm Optimization (PSO) algorithm for SC filter Optimization. In order to improve their performance the three algorithm based on their combination are proposed. The performance is investigated on the design of switched capacitor biquadratic filters and the resulting performance and limitations are discussed.

Research paper thumbnail of Analysis and Synthesis of the Digital Structures by the Matrix Method

This paper presents a general matrix algorithm for analysis of digital filters. The method propos... more This paper presents a general matrix algorithm for analysis of digital filters. The method proposed in this paper allows not only the analysis of the digital filters, but also the construction of new structures of the canonic or noncanonic digital filter. Equivalent filters of different structures can be found according to various matrix expansions. The structures can be calculated even from transfer function or from state-space matrices and with the additional advantage of requiring minimum number of shifting elements. Traditional research methods are not able to construct the system with a minimum of the shifting operations.

Research paper thumbnail of Design and realization of a filter bank by switched capacitor technique

ABSTRACT The aim of this paper is to describe a method of filter bank realization using the switc... more ABSTRACT The aim of this paper is to describe a method of filter bank realization using the switched capacitor (SC) technique. The analysis of steps needed for this realization is performed. The correct solution requires the IIR filter bank synthesis followed by the conversion to SC circuits. Due to simplicity only the two-channel filter bank is used. The main points of the whole design procedure and key recommendations for the realization are given. The complete design of SC circuits was performed by PraCAn package in Maple program and resulted circuit structures were simulated in WinSpice. The obtained results are in agreement with theoretical derivations.

Research paper thumbnail of Design of electric filters in MAPLE and through WWW interface

ABSTRACT This paper presents a system for analog filter design. The system consists of a special ... more ABSTRACT This paper presents a system for analog filter design. The system consists of a special library of functions, SYNTFIL, for the MAPLE environment which allows both approximation, computation and consecutive synthesis of an electrical circuit. A WWW interface for the complex design of filters is then presented. The WWW interface uses the above mentioned MAPLE software. The system is proposed for education in the CTU, Faculty of Electrical Engineering

Research paper thumbnail of Developing Virtual ADC Testing Environment in MAPLE

This paper proposes an innovative concept of a virtual testing environment for analog-to-digital ... more This paper proposes an innovative concept of a virtual testing environment for analog-to-digital converters (ADCs) applying a suitable conjunction of two performance extraction algorithms -the Servo-Loop and Histogram method. The testing engine proposed is implemented in MAPLE and consists of program procedures to extract ADC errors expressed in term of integral and differential non-linearity (INL and DNL). The novelty of

Research paper thumbnail of Using Evolutionary Algorithms for Optimization of Analogue Electronic Filters

InTech eBooks, Apr 26, 2011

Research paper thumbnail of Web-Based Application for Analysis of Electrical Circuits and Systems

This paper presents web-based graphical schematic editor for analysis of electric and electronic ... more This paper presents web-based graphical schematic editor for analysis of electric and electronic circuits. Continuous-time linear and nonlinear circuits as well as periodically switched linear circuits can be analysed in this editor. In case of linear circuits, results can be obtained in symbolic form. The editor uses Spice OPUS and Maple software with PraCAn package as a computation engine. All circuits created in this editor can be turned into functional blocks that can be subsequently edited through programming code. The editor contains a model of ideal, linear and nonlinear operational amplifier. The whole system is developed at the Department of Circuit Theory, for engineering education and research support.

Research paper thumbnail of Virtual Testing Environment for A/D Converters in Verilog-A and Maple Platform

ABSTRACT This paper deals with the implementation issues of building Virtual Testing Environment ... more ABSTRACT This paper deals with the implementation issues of building Virtual Testing Environment (VTE) for performance extraction of A/D converters. Here, the term "virtual" implies to the fact that the ADC testing is done yet in the circuit design on a base of an ADC model capable to capture the ADC error sources occurring in the integrated circuit structure. The first part of the contribution concerns significant properties of two proposed VTE algorithm implementations, the first one employing Verilog-A behavioral module and the second which is created in Maple environment with built-in libraries for circuit analysis. The performance of both VTE implementations is evaluated at system-level and by simulation of residual non-linearity with an ideal ADC model. Throughout the article, a stress is given to the building procedure which was necessary to create VTE capable to work both on Verilog-A and Maple platform.

Research paper thumbnail of Guidelines on the Switch Transistors Sizing Using the Symbolic Description for the Cross-Coupled Charge Pump

Radioengineering, Sep 15, 2017

This paper presents a symbolic description of the design process of the switch transistors for th... more This paper presents a symbolic description of the design process of the switch transistors for the cross-coupled charge pump applications. Discrete-time analog circuits are usually designed by the numerical algorithms in the professional simulator software which can be an extremely timeconsuming process in contrast to described analytical procedure. The significant part of the pumping losses is caused by the reverse current through the switch transistors due to the continuous-time voltage change on the main capacitors. The design process is based on the analytical expression of the time response characteristics of the pump stage as an analog system with using BSIM model equations. The main benefit of the article is the analytical transistors sizing formula so that the maximum voltage gain is achieved. The diode transistor is dimensioned for the pump requirements, as the maximal pump output ripple voltage, current, etc. The characteristics of the proposed circuit have been verified by simulation in ELDO Spice. Results are valid for N-stage charge pump and also applicable for other model equations as PSP, EKV.

Research paper thumbnail of Design aspects of the SC circuits and analysis of the cross-coupled charge pump

Ahstract-This paper presents some real properties of the cross-coupled charge pump that is used i... more Ahstract-This paper presents some real properties of the cross-coupled charge pump that is used in low power microelectronic integrated systems operating with high voltage (FLASH, EEPROM memories). SC-circuits characterization and design aspects are firstly discussed. Theoretical analysis of the cross-coupled charge pump with accompanying equations has been done. Some real properties have been simulated by ELDO Spice and compared with these assumptions. Simulation results show discrepancy between calculation and simulated pa rameters due to significant pumping losses that have been discussed in detail. Discontinuity of the output voltage through input parameters is very important finding that complicates the development of the real model for design purposes.

Research paper thumbnail of High‐speed adaptive analog filter based on fully analog artificial neural network

International Journal of Circuit Theory and Applications, Jul 10, 2023

Research paper thumbnail of Symbolic and semisymbolic analysis of electronic circuit in maple

International Conference on Circuits, Jul 14, 2011

This paper presents a usage of Maple program for electric and electronic circuit analysis. The sp... more This paper presents a usage of Maple program for electric and electronic circuit analysis. The special package PraCAn has been used for this purpose. This contribution introduces possibilities of the package for circuit linearization and following ac symbolic or semisymbolic analyses. Simplification of the active part models is done by their instance parameters to obtain useful results for dominant circuit behavior. This is demonstrated on elementary examples of electronic circuit analysis. The package was developed at the Department of Circuit Theory, CTU for research and teaching support.

Research paper thumbnail of Application for symbolic analysis of linear circuits including switched circuits

International Conference on System Science and Simulation in Engineering, Nov 21, 2007

This paper presents a tool for symbolic analysis of electronic circuits-continuous-time circuits ... more This paper presents a tool for symbolic analysis of electronic circuits-continuous-time circuits and periodically switched linear (PSL) circuits. Applied method of analysis is based on modeling of periodically switched networks by mixed s, z description. The method is implemented in program Maple TM in the form of Maple package named PraSCAn. Current version of the package provides all basic analysis of linear continuoustime circuits as well as of multiphase PSL circuits. The paper presents time domain analysis of idealized switched circuits in more detail. Described algorithm uses closed-form solution in time domain for continuous time which is implemented in the package. A system of www interface based on PraSCAn package for electronic circuit analysis via internet is presented in the next part of the article. Some results are shown in the end of the paper.

Research paper thumbnail of Description of the functional blocks for the cross-coupled charge pump design algorithm

This paper presents the circuit model that is used for the cross-coupled charge pump design algor... more This paper presents the circuit model that is used for the cross-coupled charge pump design algorithm. Symbolic description of the pump stage model as an analog functional block for high-voltage application is firstly discussed. Design process has been done by using simplified BSIM model equations assuming the long channel MOSFET. Characteristics have been verified by ELDO Spice and compared with the found relationships. Static and dynamic parameters of the subcircuit have been tested in two-stages structure by LT Spice simulator. Analysis results show the consistency between model and real circuits characteristics under given conditions. Complex model provides the reliable results for significantly smaller strange capacitances in comparision with the main pump capacitances. The model can be used for design and prediction of the pump parameters without long-time simulation process. The strong inversion region of MOSFET is expected, thus equations are correct for other MOSFET models that are used in chip design (PSP).

Research paper thumbnail of Special web-based application for electric circuit analysis

This paper presents special web-based application for analysis of electric and electronic circuit... more This paper presents special web-based application for analysis of electric and electronic circuit with administration interface. The application is based on PHP scripts and Maple with PraCAn package as a computation engine. Continuous-time linear circuits can be inserted to application database by administrator and then analyzed by users through internet. Results can be obtained in symbolic as well as semisymbolic form. The graphical interface used to display results is based on Javascript libraries and runs on user side in user browser. The whole system is developed at the Department of Circuit Theory.

Research paper thumbnail of Filters Design by Z Transformation and Pascal Matrix

In the context of the digital filter design, a great deal of research has been done to facilitate... more In the context of the digital filter design, a great deal of research has been done to facilitate their computation. The Pascal matrix defined in [1], [2] has provided its utility in this field. In this paper we summarize the direct transformation from low-pass continuous-time transfer function H(s) to discrete-time H(z) of the bandpass and bandstop transfer functions. This algorithm uses the Pascal matrix and is constructed from the rows of a Pascal triangle. The advantage of this method is that the inverse transformation is obtained with the Pascal matrix without computing the determinant of the system, which simplifies the process to obtain the associated analog transfer function H(s) if the discrete transfer function H(z) is known. Numerical example for matrices P, P1, Q and Q1 illustrate the practical utilization of this technique.

Research paper thumbnail of New Method for Measuring of Natural Frequency of Tensometrical String Sensors

ABSTRACT This page presents new method for exiting string tensometrical sensors for mechanical te... more ABSTRACT This page presents new method for exiting string tensometrical sensors for mechanical tense measurement. This method is based on the synchronized discrete exciting of the string and measuring the string oscillations. The main requirement was self-acting function of the whole system without an external exciting and controlling. The method has been verified on a functional sample.

Research paper thumbnail of Switched-current filter optimization based on evolutionary algorithms

ABSTRACT This paper describes a way to eliminate the effect of circuit nonidealities on the magni... more ABSTRACT This paper describes a way to eliminate the effect of circuit nonidealities on the magnitude frequency response of a circuit utilizing the switched-current technique. The circuit realizes a band-pass filter. The elimination is carried out by optimization based on one of evolutionary algorithms - the differential evolution. The nonidealities are nonzero on-state resistance of the switches and nonzero output conductance of the field-effect transistors implementing the current sources. It is shown that the filter with the current source transconductance values designed according to a common method for ideal components has a significantly different magnitude frequency response when the nonidealities are considered. Hence, the optimization is applied to finding suitable transconductance values so that the difference between the magnitude frequency responses of the ideal and nonideal filter is minimized.

Research paper thumbnail of Ways to Optimize Analogue Switched Circuits

DOAJ (DOAJ: Directory of Open Access Journals), Dec 1, 2008

This paper describes how analogue switched circuits (switched-capacitor and switched-current circ... more This paper describes how analogue switched circuits (switched-capacitor and switched-current circuits) can be optimized by means of a personal computer. The optimization of this kind of circuits is not so common and their analysis is more difficult in comparison with continuously working circuits. Firstly, the nonidealities occurring in these circuits whose effect on their characteristics should be optimized are discussed. Then a few ways to analyze analogue switched circuits are shown. From all optimization algorithms applicable for this kind of optimization, two ones that seem to be the most promising are proposed. The differential evolution (one of evolutionary algorithms) combined with the simplex method was found to be most appropriate from these two ones. Two types of programs are required for the optimization of these circuits: a program for implementing calculations of the used optimization algorithm and a program for the analysis of the optimized circuit. Several suitable computer programs from both of the groups together with their proper settings according to authors' experience are proposed. At the end of the paper, an example of a switched-current circuit optimization documenting the previous description is presented.

Research paper thumbnail of Implementation of a Two-Channel Maximally Decimated Filter Bank using Switched Capacitor Circuits

DOAJ (DOAJ: Directory of Open Access Journals), Apr 1, 2013

The aim of this paper is to describe the implementation of a two-channel filter bank (FB) using t... more The aim of this paper is to describe the implementation of a two-channel filter bank (FB) using the switched capacitor (SC) technique considering real properties of operational amplifiers (OpAmps). The design procedure is presented and key recommendations for the implementation are given. The implementation procedure describes the design of two-channel filter bank using an IIR Cauer filter, conversion of IIR into the SC filters and the final implementation of the SC filters. The whole design and an SC circuit implementation is performed by a PraCAn package in Maple. To verify the whole filter bank, resulting real property circuit structures are completely simulated by WinSpice and ELDO simulators. The results confirm that perfect reconstruction conditions can be almost accepted for the filter bank implemented by the SC circuits. The phase response of the SC filter bank is not strictly linear due to the IIR filters. However, the final ripple of a magnitude frequency response in the passband is almost constant, app. 0.5 dB for a real circuit analysis.

Research paper thumbnail of Optimization methods for switched capacitor circuits

International Conference on Applied Electronics, Sep 1, 2015

The paper investigates the performance of the Differential Evolution (DE) and Particle Swarm Opti... more The paper investigates the performance of the Differential Evolution (DE) and Particle Swarm Optimization (PSO) algorithm for SC filter Optimization. In order to improve their performance the three algorithm based on their combination are proposed. The performance is investigated on the design of switched capacitor biquadratic filters and the resulting performance and limitations are discussed.

Research paper thumbnail of Analysis and Synthesis of the Digital Structures by the Matrix Method

This paper presents a general matrix algorithm for analysis of digital filters. The method propos... more This paper presents a general matrix algorithm for analysis of digital filters. The method proposed in this paper allows not only the analysis of the digital filters, but also the construction of new structures of the canonic or noncanonic digital filter. Equivalent filters of different structures can be found according to various matrix expansions. The structures can be calculated even from transfer function or from state-space matrices and with the additional advantage of requiring minimum number of shifting elements. Traditional research methods are not able to construct the system with a minimum of the shifting operations.

Research paper thumbnail of Design and realization of a filter bank by switched capacitor technique

ABSTRACT The aim of this paper is to describe a method of filter bank realization using the switc... more ABSTRACT The aim of this paper is to describe a method of filter bank realization using the switched capacitor (SC) technique. The analysis of steps needed for this realization is performed. The correct solution requires the IIR filter bank synthesis followed by the conversion to SC circuits. Due to simplicity only the two-channel filter bank is used. The main points of the whole design procedure and key recommendations for the realization are given. The complete design of SC circuits was performed by PraCAn package in Maple program and resulted circuit structures were simulated in WinSpice. The obtained results are in agreement with theoretical derivations.

Research paper thumbnail of Design of electric filters in MAPLE and through WWW interface

ABSTRACT This paper presents a system for analog filter design. The system consists of a special ... more ABSTRACT This paper presents a system for analog filter design. The system consists of a special library of functions, SYNTFIL, for the MAPLE environment which allows both approximation, computation and consecutive synthesis of an electrical circuit. A WWW interface for the complex design of filters is then presented. The WWW interface uses the above mentioned MAPLE software. The system is proposed for education in the CTU, Faculty of Electrical Engineering

Research paper thumbnail of Developing Virtual ADC Testing Environment in MAPLE

This paper proposes an innovative concept of a virtual testing environment for analog-to-digital ... more This paper proposes an innovative concept of a virtual testing environment for analog-to-digital converters (ADCs) applying a suitable conjunction of two performance extraction algorithms -the Servo-Loop and Histogram method. The testing engine proposed is implemented in MAPLE and consists of program procedures to extract ADC errors expressed in term of integral and differential non-linearity (INL and DNL). The novelty of

Research paper thumbnail of Using Evolutionary Algorithms for Optimization of Analogue Electronic Filters

InTech eBooks, Apr 26, 2011

Research paper thumbnail of Web-Based Application for Analysis of Electrical Circuits and Systems

This paper presents web-based graphical schematic editor for analysis of electric and electronic ... more This paper presents web-based graphical schematic editor for analysis of electric and electronic circuits. Continuous-time linear and nonlinear circuits as well as periodically switched linear circuits can be analysed in this editor. In case of linear circuits, results can be obtained in symbolic form. The editor uses Spice OPUS and Maple software with PraCAn package as a computation engine. All circuits created in this editor can be turned into functional blocks that can be subsequently edited through programming code. The editor contains a model of ideal, linear and nonlinear operational amplifier. The whole system is developed at the Department of Circuit Theory, for engineering education and research support.

Research paper thumbnail of Virtual Testing Environment for A/D Converters in Verilog-A and Maple Platform

ABSTRACT This paper deals with the implementation issues of building Virtual Testing Environment ... more ABSTRACT This paper deals with the implementation issues of building Virtual Testing Environment (VTE) for performance extraction of A/D converters. Here, the term "virtual" implies to the fact that the ADC testing is done yet in the circuit design on a base of an ADC model capable to capture the ADC error sources occurring in the integrated circuit structure. The first part of the contribution concerns significant properties of two proposed VTE algorithm implementations, the first one employing Verilog-A behavioral module and the second which is created in Maple environment with built-in libraries for circuit analysis. The performance of both VTE implementations is evaluated at system-level and by simulation of residual non-linearity with an ideal ADC model. Throughout the article, a stress is given to the building procedure which was necessary to create VTE capable to work both on Verilog-A and Maple platform.

Research paper thumbnail of Guidelines on the Switch Transistors Sizing Using the Symbolic Description for the Cross-Coupled Charge Pump

Radioengineering, Sep 15, 2017

This paper presents a symbolic description of the design process of the switch transistors for th... more This paper presents a symbolic description of the design process of the switch transistors for the cross-coupled charge pump applications. Discrete-time analog circuits are usually designed by the numerical algorithms in the professional simulator software which can be an extremely timeconsuming process in contrast to described analytical procedure. The significant part of the pumping losses is caused by the reverse current through the switch transistors due to the continuous-time voltage change on the main capacitors. The design process is based on the analytical expression of the time response characteristics of the pump stage as an analog system with using BSIM model equations. The main benefit of the article is the analytical transistors sizing formula so that the maximum voltage gain is achieved. The diode transistor is dimensioned for the pump requirements, as the maximal pump output ripple voltage, current, etc. The characteristics of the proposed circuit have been verified by simulation in ELDO Spice. Results are valid for N-stage charge pump and also applicable for other model equations as PSP, EKV.

Research paper thumbnail of Design aspects of the SC circuits and analysis of the cross-coupled charge pump

Ahstract-This paper presents some real properties of the cross-coupled charge pump that is used i... more Ahstract-This paper presents some real properties of the cross-coupled charge pump that is used in low power microelectronic integrated systems operating with high voltage (FLASH, EEPROM memories). SC-circuits characterization and design aspects are firstly discussed. Theoretical analysis of the cross-coupled charge pump with accompanying equations has been done. Some real properties have been simulated by ELDO Spice and compared with these assumptions. Simulation results show discrepancy between calculation and simulated pa rameters due to significant pumping losses that have been discussed in detail. Discontinuity of the output voltage through input parameters is very important finding that complicates the development of the real model for design purposes.