Typical Switched-Capacitor Filter
This chapter is devoted to simplified design with a typical switched-capacitor IC filter (the National Semiconductor MF10). The IC is chosen because it is universal and can provide all five basic filter types (bandpass, notch, lowpass, highpass, and allpass) as well as responses (Butterworth, Chebyshev, Bessel, and elliptic) by connecting a few external resistors and a clock. We start with a description of the basic circuit.
2.1 Basic Circuit Functions for MF10
Figure 2-1 shows the internal circuits in block form. The IC contains all of the elements necessary for two complete 2nd-order filters in one 20-pin package. Notice that each filter section contains two non-inverting integrators. The time constant ...
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