Saul Rodriguez - Academia.edu (original) (raw)
Papers by Saul Rodriguez
2013 IEEE 11th International New Circuits and Systems Conference (NEWCAS), 2013
ABSTRACT Incremental sigma-delta (I⌃") analog-to-digital converters (ADCs), which are es... more ABSTRACT Incremental sigma-delta (I⌃") analog-to-digital converters (ADCs), which are essentially ⌃" ADCs with periodic resetting, are well suited for low-power low-speed biosensor applications. In recent years, the potential advantage in terms of power dissipation of continuous-time (CT) I⌃" ADCs have been explored. This paper analyzes the impact of feedback digitalto- analog converters (DACs) on the performance of CT I⌃" ADCs. Different feedback DAC schemes are firstly analyzed and then evaluated by employing them in a 3rd order singlebit CT I⌃" ADC. Simulation results are discussed considering the trade-off between the timing error sensitivity and the power consumption, thereby offering a reference for selecting a power efficient feedback DAC scheme.
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2008 Joint 6th International IEEE Northeast Workshop on Circuits and Systems and TAISA Conference, 2008
Abstract This paper presents the design and implementation of an all-programmable frequency div... more Abstract This paper presents the design and implementation of an all-programmable frequency divider with an ultra-wide division range for use in Phase-Locked Loops. The proposed divider uses a fully modular architecture and dynamic logic implemented in TSMC 0.18μm ...
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2010 17th IEEE International Conference on Electronics, Circuits and Systems, 2010
Abstract This paper presents a wideband, direct-conversion radio receiver front-end that targets ... more Abstract This paper presents a wideband, direct-conversion radio receiver front-end that targets all WiMAX/WLAN bands from 2.3-GHz to 5.8-GHz. The receiver front-end is fabricated in 0.18-μm CMOS and achieves a gain of 25 dB, noise figure of 6 dB, and IIP3 ...
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2006 1st Electronic Systemintegration Technology Conference, 2006
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2009 International Symposium on Signals, Circuits and Systems, 2009
AbstractIn this paper a low-power design of an integrated RF receiver for Wireless Sensor Networ... more AbstractIn this paper a low-power design of an integrated RF receiver for Wireless Sensor Networks (WSNs) in 90 nm CMOS technology is proposed. The receiver is IEEE 802.15.4 physical specifications compliant. It is designed to operate in ISM band at 2.45 GHz center ...
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2012 19th IEEE International Conference on Electronics, Circuits, and Systems (ICECS 2012), 2012
ABSTRACT The performance of continuous-time (CT) sigmadelta (ΣΔ) modulators is severely degraded ... more ABSTRACT The performance of continuous-time (CT) sigmadelta (ΣΔ) modulators is severely degraded by the clock jitter induced timing variation in their feedback digital-to-analog converters (DACs). To mitigate this non-ideality, jitter sensitivity reduction techniques that employ exponentially decaying pulse shape DACs have been recently reported. In this paper, exponentially decaying DACs are investigated and generalized expressions are derived. In addition, another exponentially decaying DAC is proposed, which can potentially achieve both good jitter immunity and amplitude efficiency. To validate the theoretical results, the proposed DAC, together with other exponentially decaying DACs, are employed in a 3rd order 1-bit CT ΣΔ modulator test case and evaluated through behavioral simulations.
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2008 IEEE International Symposium on Circuits and Systems, 2008
I. INTRODUCTION Along with the globalization of manufacturing and supply chain, the development o... more I. INTRODUCTION Along with the globalization of manufacturing and supply chain, the development of economy and the growth of retailing, automatic identification (ID) procedure has become popular all over the world in recent years. Barcode, which is formed from narrow and wide bars ...
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Analog Integrated Circuits and Signal Processing, 2009
Abstract This paper presents a tool capable of automatically compiling the circuit of a direct-co... more Abstract This paper presents a tool capable of automatically compiling the circuit of a direct-conversion receiver at the schematics level based on system specifications that include the frequency of operation, gain, noise figure, IIP2 and IIP3 linearity. The front-end of a direct-...
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2008 4th IEEE International Conference on Circuits and Systems for Communications, 2008
This paper presents a new digital calibration methodology that allows CMOS Gilbert cell down-conv... more This paper presents a new digital calibration methodology that allows CMOS Gilbert cell down-converters to meet their block specifications under large process, temperature and power supply variations. The calibration method consists of a novel built-in self test for direct conversion receivers that is able to measure the gain, and the second and third order intermodulation products of the mixer. A
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2006 13th IEEE International Conference on Electronics, Circuits and Systems, 2006
Abstract This paper introduces a design methodology for a current-reuse wideband CMOS low noise a... more Abstract This paper introduces a design methodology for a current-reuse wideband CMOS low noise amplifier (LNA). A theoretic analysis of source degeneration current-reuse CMOS LNAs is presented. The advantages and limitations of wideband amplification using this ...
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2014 NORCHIP, 2014
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2013 IEEE 20th International Conference on Electronics, Circuits, and Systems (ICECS), 2013
ABSTRACT This paper presents an ultra-low power control circuit for a DC-DC boost converter targe... more ABSTRACT This paper presents an ultra-low power control circuit for a DC-DC boost converter targeting implantable thermoelectric energy harvesting applications. Efficiency of the input converter is enhanced by utilizing zero-current switching technique. Adaptive delay between ON states of switches assures zero-voltage switching of synchronous rectifier and reduces switching losses. The control circuit employing both techniques consumes an average power of 620nW. This allows the converter to operate from harvested power below 5μW. For voltage conversion ratios above 20, the proposed circuits and techniques demonstrate efficiency improvement compared to the state-of-the-art solutions.
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2009 International Symposium on Signals, Circuits and Systems, 2009
Abstract This paper presents the design challenges and solutions for 4 G nanometer radio receiver... more Abstract This paper presents the design challenges and solutions for 4 G nanometer radio receivers for mobile devices. The specifications for the ZERO-IF/LOW-IF 4 G receiver architecture are derived. Limitations due to the use of low-voltage nanometer technologies ...
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2009 NORCHIP, 2009
Abstract This paper presents an electromagnetic simulation-based modelling solution for active an... more Abstract This paper presents an electromagnetic simulation-based modelling solution for active and passive devices which targets 60 GHz front-end integrated circuits. An EM model, using existing transistor compact models as core, is developed to account for the parasitic ...
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Abstract This paper introduces a design methodology for a current-reuse wideband CMOS low noise a... more Abstract This paper introduces a design methodology for a current-reuse wideband CMOS low noise amplifier (LNA). A theoretic analysis of source degeneration current-reuse CMOS LNAs is presented. The advantages and limitations of wideband amplification using this ...
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2008 3rd International Design and Test Workshop, 2008
Abstract this paper presents a system level design of radio frequency receiver supporting WiMAX... more Abstract this paper presents a system level design of radio frequency receiver supporting WiMAX mobile standard. Based on direct conversion receiver, the distribution of the total radio system specifications to the individual receiver components is discussed. System level ...
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2011 IEEE Biomedical Circuits and Systems Conference (BioCAS), 2011
Abstract Current-mirror-based potentiostats suffer from systematic and random errors causing offs... more Abstract Current-mirror-based potentiostats suffer from systematic and random errors causing offset, gain and linearity error in reading out the sensor data. In this work, a new potentiostat topology is proposed to eliminate the systematic error via an error-...
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2011 11th International Conference on ITS Telecommunications, 2011
Abstract Due to the pervasive deployments of mobile communication technologies, vehicle positioni... more Abstract Due to the pervasive deployments of mobile communication technologies, vehicle positioning and tracking by locating the driver's mobile phones has become feasible. However, no single positioning method can provide decent tradeoff between accuracy ...
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WMNC2010, 2010
Abstract The ability to locate the position of a mobile device has emerged as a key facility of e... more Abstract The ability to locate the position of a mobile device has emerged as a key facility of existing and future generation mobile systems. Many value added location based services have been enabled by this feature. Due to the pervasive deployments of mobile ...
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IEEE International Symposium on Circuits and Systems, 2008
I. INTRODUCTION Along with the globalization of manufacturing and supply chain, the development o... more I. INTRODUCTION Along with the globalization of manufacturing and supply chain, the development of economy and the growth of retailing, automatic identification (ID) procedure has become popular all over the world in recent years. Barcode, which is formed from narrow and wide bars ...
Bookmarks Related papers MentionsView impact
2013 IEEE 11th International New Circuits and Systems Conference (NEWCAS), 2013
ABSTRACT Incremental sigma-delta (I⌃") analog-to-digital converters (ADCs), which are es... more ABSTRACT Incremental sigma-delta (I⌃") analog-to-digital converters (ADCs), which are essentially ⌃" ADCs with periodic resetting, are well suited for low-power low-speed biosensor applications. In recent years, the potential advantage in terms of power dissipation of continuous-time (CT) I⌃" ADCs have been explored. This paper analyzes the impact of feedback digitalto- analog converters (DACs) on the performance of CT I⌃" ADCs. Different feedback DAC schemes are firstly analyzed and then evaluated by employing them in a 3rd order singlebit CT I⌃" ADC. Simulation results are discussed considering the trade-off between the timing error sensitivity and the power consumption, thereby offering a reference for selecting a power efficient feedback DAC scheme.
Bookmarks Related papers MentionsView impact
2008 Joint 6th International IEEE Northeast Workshop on Circuits and Systems and TAISA Conference, 2008
Abstract This paper presents the design and implementation of an all-programmable frequency div... more Abstract This paper presents the design and implementation of an all-programmable frequency divider with an ultra-wide division range for use in Phase-Locked Loops. The proposed divider uses a fully modular architecture and dynamic logic implemented in TSMC 0.18μm ...
Bookmarks Related papers MentionsView impact
2010 17th IEEE International Conference on Electronics, Circuits and Systems, 2010
Abstract This paper presents a wideband, direct-conversion radio receiver front-end that targets ... more Abstract This paper presents a wideband, direct-conversion radio receiver front-end that targets all WiMAX/WLAN bands from 2.3-GHz to 5.8-GHz. The receiver front-end is fabricated in 0.18-μm CMOS and achieves a gain of 25 dB, noise figure of 6 dB, and IIP3 ...
Bookmarks Related papers MentionsView impact
2006 1st Electronic Systemintegration Technology Conference, 2006
Bookmarks Related papers MentionsView impact
2009 International Symposium on Signals, Circuits and Systems, 2009
AbstractIn this paper a low-power design of an integrated RF receiver for Wireless Sensor Networ... more AbstractIn this paper a low-power design of an integrated RF receiver for Wireless Sensor Networks (WSNs) in 90 nm CMOS technology is proposed. The receiver is IEEE 802.15.4 physical specifications compliant. It is designed to operate in ISM band at 2.45 GHz center ...
Bookmarks Related papers MentionsView impact
2012 19th IEEE International Conference on Electronics, Circuits, and Systems (ICECS 2012), 2012
ABSTRACT The performance of continuous-time (CT) sigmadelta (ΣΔ) modulators is severely degraded ... more ABSTRACT The performance of continuous-time (CT) sigmadelta (ΣΔ) modulators is severely degraded by the clock jitter induced timing variation in their feedback digital-to-analog converters (DACs). To mitigate this non-ideality, jitter sensitivity reduction techniques that employ exponentially decaying pulse shape DACs have been recently reported. In this paper, exponentially decaying DACs are investigated and generalized expressions are derived. In addition, another exponentially decaying DAC is proposed, which can potentially achieve both good jitter immunity and amplitude efficiency. To validate the theoretical results, the proposed DAC, together with other exponentially decaying DACs, are employed in a 3rd order 1-bit CT ΣΔ modulator test case and evaluated through behavioral simulations.
Bookmarks Related papers MentionsView impact
2008 IEEE International Symposium on Circuits and Systems, 2008
I. INTRODUCTION Along with the globalization of manufacturing and supply chain, the development o... more I. INTRODUCTION Along with the globalization of manufacturing and supply chain, the development of economy and the growth of retailing, automatic identification (ID) procedure has become popular all over the world in recent years. Barcode, which is formed from narrow and wide bars ...
Bookmarks Related papers MentionsView impact
Analog Integrated Circuits and Signal Processing, 2009
Abstract This paper presents a tool capable of automatically compiling the circuit of a direct-co... more Abstract This paper presents a tool capable of automatically compiling the circuit of a direct-conversion receiver at the schematics level based on system specifications that include the frequency of operation, gain, noise figure, IIP2 and IIP3 linearity. The front-end of a direct-...
Bookmarks Related papers MentionsView impact
2008 4th IEEE International Conference on Circuits and Systems for Communications, 2008
This paper presents a new digital calibration methodology that allows CMOS Gilbert cell down-conv... more This paper presents a new digital calibration methodology that allows CMOS Gilbert cell down-converters to meet their block specifications under large process, temperature and power supply variations. The calibration method consists of a novel built-in self test for direct conversion receivers that is able to measure the gain, and the second and third order intermodulation products of the mixer. A
Bookmarks Related papers MentionsView impact
2006 13th IEEE International Conference on Electronics, Circuits and Systems, 2006
Abstract This paper introduces a design methodology for a current-reuse wideband CMOS low noise a... more Abstract This paper introduces a design methodology for a current-reuse wideband CMOS low noise amplifier (LNA). A theoretic analysis of source degeneration current-reuse CMOS LNAs is presented. The advantages and limitations of wideband amplification using this ...
Bookmarks Related papers MentionsView impact
2014 NORCHIP, 2014
Bookmarks Related papers MentionsView impact
2013 IEEE 20th International Conference on Electronics, Circuits, and Systems (ICECS), 2013
ABSTRACT This paper presents an ultra-low power control circuit for a DC-DC boost converter targe... more ABSTRACT This paper presents an ultra-low power control circuit for a DC-DC boost converter targeting implantable thermoelectric energy harvesting applications. Efficiency of the input converter is enhanced by utilizing zero-current switching technique. Adaptive delay between ON states of switches assures zero-voltage switching of synchronous rectifier and reduces switching losses. The control circuit employing both techniques consumes an average power of 620nW. This allows the converter to operate from harvested power below 5μW. For voltage conversion ratios above 20, the proposed circuits and techniques demonstrate efficiency improvement compared to the state-of-the-art solutions.
Bookmarks Related papers MentionsView impact
2009 International Symposium on Signals, Circuits and Systems, 2009
Abstract This paper presents the design challenges and solutions for 4 G nanometer radio receiver... more Abstract This paper presents the design challenges and solutions for 4 G nanometer radio receivers for mobile devices. The specifications for the ZERO-IF/LOW-IF 4 G receiver architecture are derived. Limitations due to the use of low-voltage nanometer technologies ...
Bookmarks Related papers MentionsView impact
2009 NORCHIP, 2009
Abstract This paper presents an electromagnetic simulation-based modelling solution for active an... more Abstract This paper presents an electromagnetic simulation-based modelling solution for active and passive devices which targets 60 GHz front-end integrated circuits. An EM model, using existing transistor compact models as core, is developed to account for the parasitic ...
Bookmarks Related papers MentionsView impact
Abstract This paper introduces a design methodology for a current-reuse wideband CMOS low noise a... more Abstract This paper introduces a design methodology for a current-reuse wideband CMOS low noise amplifier (LNA). A theoretic analysis of source degeneration current-reuse CMOS LNAs is presented. The advantages and limitations of wideband amplification using this ...
Bookmarks Related papers MentionsView impact
2008 3rd International Design and Test Workshop, 2008
Abstract this paper presents a system level design of radio frequency receiver supporting WiMAX... more Abstract this paper presents a system level design of radio frequency receiver supporting WiMAX mobile standard. Based on direct conversion receiver, the distribution of the total radio system specifications to the individual receiver components is discussed. System level ...
Bookmarks Related papers MentionsView impact
2011 IEEE Biomedical Circuits and Systems Conference (BioCAS), 2011
Abstract Current-mirror-based potentiostats suffer from systematic and random errors causing offs... more Abstract Current-mirror-based potentiostats suffer from systematic and random errors causing offset, gain and linearity error in reading out the sensor data. In this work, a new potentiostat topology is proposed to eliminate the systematic error via an error-...
Bookmarks Related papers MentionsView impact
2011 11th International Conference on ITS Telecommunications, 2011
Abstract Due to the pervasive deployments of mobile communication technologies, vehicle positioni... more Abstract Due to the pervasive deployments of mobile communication technologies, vehicle positioning and tracking by locating the driver's mobile phones has become feasible. However, no single positioning method can provide decent tradeoff between accuracy ...
Bookmarks Related papers MentionsView impact
WMNC2010, 2010
Abstract The ability to locate the position of a mobile device has emerged as a key facility of e... more Abstract The ability to locate the position of a mobile device has emerged as a key facility of existing and future generation mobile systems. Many value added location based services have been enabled by this feature. Due to the pervasive deployments of mobile ...
Bookmarks Related papers MentionsView impact
IEEE International Symposium on Circuits and Systems, 2008
I. INTRODUCTION Along with the globalization of manufacturing and supply chain, the development o... more I. INTRODUCTION Along with the globalization of manufacturing and supply chain, the development of economy and the growth of retailing, automatic identification (ID) procedure has become popular all over the world in recent years. Barcode, which is formed from narrow and wide bars ...
Bookmarks Related papers MentionsView impact