Tunable active filter

Details Tunable active filter Tunable active filter

1983-01-27

1985-04-02

Mullins, James B.

Amplifiers

Signal feedback

Phase shift means in loop path

330109, 330305, H03F 304

Patent

active

045090190

ABSTRACT:
A tunable high-pass or low-pass filter employs a balanced amplifier having electronically controlled elements in either the two input or the two feedback paths (or both). A reactive element is placed in the other of the paths. Especially low distortion results from this arrangement, allowing convenient integrated circuit implementation with a nonlinear device (e.g., MOS transistor) as a voltage-controllable element. Multiple stages can be cascaded and controlled from a reference clock or other precision source for high accuracy.

REFERENCES:
patent: 3500223 (1970-03-01), Thurnell
patent: 3747007 (1973-07-01), Geitner
patent: 4329599 (1982-05-01), Gregorian et al.
patent: 4356451 (1982-10-01), Wilson
"Fully Integrated Analog Filters Using Bipolar-JFET Tech.," K. Tan et al., IEEE Journal of Solid-State Circuits, vol. SC-13, No. 6, Dec. 1978, pp. 814-821.
"A Low-Noise Chopper-Stabilized Differential Switched-Capacitor Filtering Technique," K. Hsieh et al., IEEE Journal of Solid-State Circuits, vol. SC-16, No. 6, Dec. 1981, pp. 708-715.
"A Continuous-Time Analog Filter Using MOS Technology," W. Kellner, Frequenz, vol. 35, 1981, pp. 340-343.
"FET Limits and Resets Operational Amplifiers," Electronic Design, P. A. Ralatos, Nov. 1965, (2 pages).
"Operation of a MOS Transistor as a Variable Resistor," Bilotti, Proceedings of the IEEE, Aug. 1966, pp. 1093-1094.

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