CMOS switched-capacitor filter for a two-chip PCM voice coder
Roubik Gregorian, Y.A. Haque, Ruishi Mao, R. Blasco, W.E. Nicholson · 1979
This paper will cover a CMOS switched-capacitor filter for a PCM CODEC. Circuit consists of an elliptic low-pass ladder, a biquadratic high-pass filter and a state-space elliptic low-pass filter with a built-in sin X/X corrector.