REFERENCES
- Hirano (K) and Nishimura (S). Active-RC Filters Con taining Periodically-Operated Switches. IEEE Trans. CT-19, 5, 1972; 253–260.
- Fleischer (P E) and Tow (J). Design Formulas for Biquad Active Filters Using Three Op. Amps. Proc. IEEE. 61, 5; 1973; 662–663.
- Harris (R W) and Lee (H T). Digitally-Controlled Conductances yield Tunable Active Filters. IEEE J. Solid-State Circuits. SC-10, 3; 1975; 182–185.