
Demystifying Switched-Capacitor Circuits
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However, like many other SC Nyquist-rate data converters, the preceding SC
DAC suffers from circuit imperfections such as the capacitor mismatch, the nonideal
op-amp (e.g., input offset and fi nite gain), parasitic capacitance, and charge injection.
Although the latter two can be alleviated by adopting a fully differential structure
and a more careful layout, the cancellation of the remainders is nontrivial. We
learned in Section 5.3 that the errors due to capacitor mismatch can be removed
using analog or digital calibrations. In addition, the problems due to the op-amp’s
imperfections can be effecti ...