Transmission circuit with improved gain control loop

Details Transmission circuit with improved gain control loop Transmission circuit with improved gain control loop

1994-11-18

1997-08-19

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

With feedback of modulated output signal

455116, 455127, 455571, 330129, 330279, H04B 104

Patent

active

056598939

ABSTRACT:
In a transmission circuit, part of the output signal of the transmission circuit is diverted by an output monitor circuit and subjected to envelope detection by an output detector circuit. The output signal of the output detector circuit is inputted to a peak hold circuit successively holding the peaks of the input signal, so that varying amplitude components are removed, and a DC value is detected. An error detector circuit compares the detected value with a reference signal from a reference signal generator circuit, and the error signal is used as a gain control signal to control the gain of a power amplifier circuit.

REFERENCES:
patent: 3486128 (1969-12-01), Lohrmann
patent: 3900823 (1975-08-01), Sokal et al.
patent: 4631491 (1986-12-01), Smithers
patent: 4709403 (1987-11-01), Kikuchi
patent: 4873493 (1989-10-01), Fujiwara
patent: 4996501 (1991-02-01), Sano et al.
patent: 5063287 (1991-11-01), Trace et al.
patent: 5144258 (1992-09-01), Nakanishi et al.
patent: 5146614 (1992-09-01), Furuno

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