Feedback stabilized Q multiplier filter circuit

Details Feedback stabilized Q multiplier filter circuit Feedback stabilized Q multiplier filter circuit

1991-08-09

1994-04-12

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455126, 455266, 455307, 333 171, H04B 148, H04B 110

Patent

active

053033949

ABSTRACT:
A Q multiplier circuit which is automatically feedback stabilized through the use of phase and gain control loops and thereby adapted for use as an amplifier and filter. In a typical embodiment, a variable gain amplifier and band pass filter are provided in a forward signal path while a phase shifter is provided in a feedback signal path. The output of the circuit is sampled and compared to a fixed reference in order to generate a gain control signal for application to the variable gain amplifier. The input signal on the forward signal path is sampled along with the signal on the feedback signal path and the phases of these samples are compared in order to generate a phase control signal for application to the phase shifter. The variable gain amplifier is controlled to maintain a predetermined power output level while the phase shifter is controlled to maintain positive feed back.

REFERENCES:
patent: 3667067 (1972-05-01), Levell
patent: 3900823 (1975-08-01), Sokal et al.
patent: 4190808 (1980-02-01), Fajen
patent: 4476437 (1984-10-01), Fujiwara
patent: 4532478 (1985-07-01), Silagi
patent: 4563775 (1986-01-01), Yokosuka
patent: 4709403 (1987-11-01), Kikuchi
patent: 4819268 (1989-04-01), Kahn
patent: 4872206 (1989-10-01), Graziadei et al.
patent: 5101173 (1992-03-01), Di Piazza
patent: 5175879 (1992-12-01), Ellingson et al.
Shrader, Robert L., Electronic Communication, 1985, pp. 222-223.

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