Practical Considerations for Switched-Capacitor Filters
This chapter is devoted to the practical side of switched-capacitor filters (SCFs), stressing both their capabilities and limitations. The discussion revolves around the Linear Technology IC filters, but also applies to all present-day SCFs in IC form. We start with a comparison of SCFs and active RC filters. (Chapter 9 describes the simplified design approach for active RC filters.)
8.1 SCFs versus Active RC Filters
Figures 8-1 and 8-2 show a comparison between SCFs and active RC filters. In both cases, the building block is the integrator. When the integrator is implemented with resistors, capacitors, and op amps (as described in Chapter 9), the design is expensive and sensitive ...
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