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. Most of our study deals with Switched-Capacitor amplifiers butthe concepts can be applied to other discrete-time Circuits as well.
sampling techniques. Second, we consider SC amplifier topologies. Chapter 12. Introduction to Switched-Capacitor Circuits 400 12.2 Sampling Switches 12.2.1 MOSFETS as Switches A simple sampling circuit consists of a switch and a capacitor [Fig. 12.8(a)]. A MOS transistor
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