Transcription of Introduction to Switched-Capacitor Circuits
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12 Introduction to Switched-CapacitorCircuitsOur study of amplifiers in previous chapters has dealt with only cases where the input signal iscontinuously available and applied to the circuit and the output signal is continuously continuous-time Circuits , such amplifiers find wide application in audio, video, and high-speed analog systems. In many situations, however, we may sense the input only at periodic instantsof time, ignoring its value at other times. The circuit then processes each sample, producing avalid output at the end of each period. Such Circuits are called discrete-time or sampled-data this chapter, we study a common class of discrete-time systems called Switched-Capacitor (SC) Circuits . Our objective is to provide the foundation for more advanced topics such as filters,comparators, ADCs, and DACs.
current through C 2 approaches zero. That is, the feedback capacitor does not reduce the open-loop gain of the amplifier if the output voltage is given enough time to settle. In Fig. 12.1, on the other hand, R 2 continuously loads the amplifier. The switched-capacitor amplifier of Fig. 12.4 lends itself to implementationin CMOS technol-
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