Voltage controlled filter

Details Voltage controlled filter Voltage controlled filter

1975-07-28

1977-05-10

Rolinec, Rudolph V.

Amplifiers

Signal feedback

Phase shift means in loop path

330 35, 330 86, H03F 136

Patent

active

040231135

ABSTRACT:
A voltage controlled filter with a plurality of cascaded phase shift circuit stages in a negative feedback path of an amplifier. Each phase shift circuit stage is a RC phase shift network which includes a series capacitor and a field effect transistor (FET) with its source-drain circuit connected as a shunt to ground. The magnitude of the effective source-drain resistance of the FET in each stage is controlled by a DC control voltage which is applied in common to the gate of each FET.

REFERENCES:
patent: 3289102 (1966-11-01), Hayashi
Altman - "Discrete Semiconductor Devices Proliferate and Prosper-Electronics, pp. 85-94, Apr. 26, 1973.

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