Demystifying Switched Capacitor Circuits

Demystifying Switched-Capacitor Circuits

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standard deviation of 0.1% is generated using MATLAB. The new capacitor values

with the mismatch elements are used to replace the ideal ones in the SWITCAP

netlist. Then the effect of capacitor mismatch on the fi lter’s passband performance is

simulated in a SWITCAP environment, and the result is shown in Figure 4.11.

Note that the capacitor mismatch has caused the peaking in the passband to

exceed 0.1 dB, which is not trivial as compared to the 0.1-dB limit that we specifi ed

earlier. Nevertheless, the peaking is still below the original specifi cation in Table 4.1

(i.e., 0.3 dB).

4.4 High-Frequency CMOS ...