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Introduction to Switched-Capacitor Circuits

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 .

circuit of Fig. 12.5(a). For a high-gain op amp, V B = out 0, and hence the voltage across C 1 is approximately equal to V in. Next, at t = 0, S1 and 2 turn off and 3 turns on, pulling node A to ground. Since V A changes from in 0 to 0, the output voltage must change from zero to 0 C 1 =C 2. The output voltage change can also be calculated by ...

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