Demand for low-power low-voltage integrated circuits (ICs) has  rapidly grown due to the increasing importance of portable equipment  in all market segments including telecommunications, computers, and  consumer electronics. The need for low-voltage ICs is further  motivated by CMOS technology scaling that requires low supply voltages  for device reliability. On the other hand, switched-capacitor (SC)  circuits, which have been well known for high accuracy and low  distortion, have also become increasingly attractive for low-voltage,  low-power, and even high-frequency applications. Switched-opamp (SO)  technique has been proposed to enable SC circuits to operate with a  single 1-V supply in standard CMOS processes without any clock voltage  multiplier or low-threshold devices. However, the existing SO  technique requires the opamps to turn off after their integrating  phases and thus is not suitable for most of the switched-capacitor  systems.   In Design of Low-Voltage CMOS Switched-Opamp Switched-Capacitor  Systems, the emphasis is put on the design and development of  advanced switched-opamp architectures and techniques for low-voltage  low-power switched-capacitor (SC) systems. Specifically, the book  presents a novel multi-phase switched-opamp technique together with  new system architectures that are critical in improving significantly  the performance of switched-capacitor systems at low supply voltages:       1. A generic fast-settling double-sampling SC biquadratic filter  architecture is proposed to achieve high-speed operation for SC  circuits.      2. A low-voltage double-sampling (DS)  finite-gain-compensation (FGC) technique is employed to realize  high-resolution SD modulator using only low-DC-gain opamps to maximize  the speed and to reduce power dissipation.      3. A family of novel  power-efficient SC filters and SD modulators are built based on using  only half-delay SC integrators.      4. Single-opamp-based SC systems  are designed for ultra-low-power applications.    In addition, on the circuit level, a fast-switching methodology is  proposed for the design of the switchable opamps to achieve switching  frequency up to 50 MHz at 1V, which is improved by about ten times  compared to the prior arts.   Finally, detailed design considerations, architecture choices, and  circuit implementation of five chip prototypes are presented to  illustrate potential applications of the proposed multi-phase  switched-opamp technique to tackle with and to achieve different  stringent design corners such as high-speed, high-integration-level  and ultra-low-power consumption at supply voltages of 1V or lower in  standard CMOS processes.

Design of Low-Voltage CMOS Switched-Opamp Switched-Capacitor Systems PDF

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