Demystifying Switched Capacitor Circuits

Demystifying Switched-Capacitor Circuits

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that switch sharing is employed), whereas the second stage is realized based on the

Type-2 biquad shown in Figure 4.3. Additionally, note that the fi lter output jumps

only during the P

2

phase.

The next step is to use dynamic range scaling to scale the peak output voltage of

each op-amp. Figures 4.9(a) and (b) illustrate the output of each op-amp before and

after scaling, respectively. The peak op-amp output voltages before scaling shown in

Figure 4.9(a) are obtained from SWITCAP (see Chapter 3) simulation based on the

circuit shown in Figure 4.8, using the initial capacitance values calculated by

(a) ...