The Study and Design Techniques of CMOS Based Analog Filters An Overview (original) (raw)
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Low-voltage Analog CMOS filter design
1993 IEEE International Symposium on Circuits and Systems, 1993
Design techniques for low-voltage analog TUters In CMOS technologies are discussed. The use of OTA-C implementation techniques towards low power supply voltages (3 V and below) requires special source degeneration and input signal folding techniques. Firstly, design techniques to achieve Pull CMOS continuous-time filters with low distortlon (Total harmonic distortion c -50 dB) and low power supply voltages (3 V) are discussed. The use of switched-capacitor techniques at extremely low voltages (1.5 V) requjre extra care for the switches in the circuit. Special design techniques, such as voltage multlpliers for the clock drivers and single transistor switches, are analyzed to achieve the low power supply speciflcatlons.
Designing analog circuits in CMOS
2004
The evolution in CMOS technology dictated by Moore's Law is clearly beneficial for designers of digital circuits, but it presents difficult challenges, such as lowered nominal supply voltages, for their peers in the analog world who want to keep pace with this rapid progression. This article discusses a number of significant items for analog designs in modern and future CMOS processes and possible ways to maintain performance. Today's ICs are mixed-signal systems consisting of a large digital core, including a CPU or digital signal processor and memory, surrounded by all kinds of analog interface electronics like I/O, digital-to-analog and analog-to-digital converters, RF front ends and more. From an integration point of view, all these functions are ideally merged into a single die. In that case, the analog electronics are realized on the same die as the digital core and consequently must cope with the digital-dictated CMOS evolution.
State of the art in the analog CMOS circuit design
Proceedings of the IEEE, 1987
This paper is not intended to cover CMOS analog circuit design exhaustively. Yet, it describes how much CMOS technology has been involved in analog circuit design despite the general opinion that CMOS is only suited for digital design. After some developments in the CMOS technology have been discussed, the analog building block scene is covered. The analog building blocks can roughly be divided into two subgroups: the switched-capacitor and the non-switched-capacitor building blocks. Following this subdivision different approaches are briefly looked at. Several tables conclude this review and indicate that new analog developments in CMOS circuit design are still to be expected. Next, the CAD tool development for analog CMOS is discussed, showing that there is still a lot to be done in the field of automated analog design. In conclusion, some ideas concerning analog CAD or, concerning CAD in a more general sense are described.
Realization of Analog Circuits using Double Gate MOSFET at 32nm CMOS Technology
2015
n this paper, design of analog circuit using double gate (DG) MOSFET where the front gate output is changed by control voltage on the back gate. The DG devices can be used to improve the performance and reduce the power dissipation when the front gate and back gate both are independently controlled. The analysis of the analog circuits such as CMOS amplifier pair, Schmitt trigger circuit and operational trans- conductance amplifier. Transient response and output DC response of analog tunable circuits are going to be analyzed. These circuit blocks are used for low-noise, high performance integrated circuits for analog and mixed-signal applications. The design and simulation results are predicted by Microwind tool in 32nm complementary metal oxide semiconductor (CMOS) technology. KeywordsCircuits, Double Gate, Transient and output DC response
A Mixed-Signal Matched-Filter Design and Simulation
2007 15th International Conference on Digital Signal Processing, 2007
A 0.35μ-CMOS mixed-signal programmable filter suitable for high-rate communication systems is designed and investigated. The proposed filter has analog input and analogsampled outputs. Filter taps are stored in a digital memory and can be changed on the fly. The filter structure is based on a bank of digitally controlled transconductors along with small capacitors. The employed transconductors are based on simple inverter and thus can be integrated efficiently with the digital parts of a system. A FIR cosine rolloff filter is designed and investigated by simulation in time and frequency domains. The results show that the proposed structure has a good speed-complexity-consumption trade-off. 272 1-4244-0882-2/07/$20.00 c 2007 IEEE Authorized licensed use limited to: MIT Libraries. Downloaded on July 2, 2009 at 17:55 from IEEE Xplore. Restrictions apply.
Continuous-Time Analog Filter based on a Programmable CMOS Current Cell
This work presents an active filter design using a programmable basic cell. In contrast to traditional design techniques, the cell allows to the designer to configure it to build gain stages and circuits emulating resistors. The proposed cell is a PPN current branch, where the sizing of transistors is done by using the Ohm's law and needed node voltages given by the designer. The cell's sizing warranty why, when designing a circuit based on the cell, the connection of them do not alter the operation point of the circuit. SPICE simulations show the usefulness of the cell to design analog integrated circuits. As an example, a single-ended Sallen-&-Key 2 nd order band-pass filter is designed and analyzed. The active filter is designed in a standard 0.5m, 2.5V CMOS technology. The expected performance of the filter shows the relevance of the circuit analysis based on a design method, and supported on physical principles.
Advances in Solid State Circuit Technologies, 2010
Continuous-Time Analog Filtering: Design Strategies and Programmability in CMOS Technologies for VHF Applications 143 a n i n te n d e d pa s s i v e d e v i c e i s p r o b ab l y a s old as the MOS transistor concept itself. An alternative to implementing linear capacitors is to use the gate-to-channel capacitance of MOSFET devices as capacitors, where the gate-oxide thickness is a well-controlled variable in the process. This option will be considered in this work. Therefore, in this chapter we will show the best way to implement key analog building blocks of a high-speed system in a CMOS technology with a wide programmable frequency range; considering new design techniques and uncovering potential problems associated with the design of high-speed analog circuits using short-channel and low-voltage devices. These are the challenges of CMOS filter design at very high frequencies and this study addresses the theoretical and practical problems encountered in the design of robust, programmable continuous-time filters with very high bandwidths implemented in low-cost digital CMOS technologies.