Telecommunications – Transmitter – With feedback of modulated output signal
Patent
1995-09-19
1998-12-22
Chin, Wellington
Telecommunications
Transmitter
With feedback of modulated output signal
455127, 330129, H04B 104
Patent
active
058527702
ABSTRACT:
A device for controlling the signal output of transmission equipment, which includes a power amplifier circuit for amplifying an inputted transmission signal by an amplification factor decided by an applied first control voltage, a coupler for monitoring the transmission signal amplified by the power amplifier circuit, a variable gain amplifier for amplifying the monitoring signal by an amplification factor decided by an applied second control voltage, a detection circuit for detecting a output signal of the variable gain amplifier and generating a detection voltage, a differential amplifier for comparing the detection voltage and a supplied reference voltage and amplifying the difference to generate a first control signal, and a control circuit for generating the reference voltage and the second control voltage, so that when the radio output is controlled, the gain of the variable gain amplifier is adjusted by the control circuit so that the level of the monitoring signal falls within the range for which detection by the detection means is possible.
REFERENCES:
patent: 5128629 (1992-07-01), Trinh
patent: 5193224 (1993-03-01), McNicol et al.
patent: 5307512 (1994-04-01), Mitzlaff
patent: 5313658 (1994-05-01), Nakamura
patent: 5371473 (1994-12-01), Trinh et al.
patent: 5376895 (1994-12-01), Aihara
Chin Wellington
Nguyen Lee
Sanyo Electric Co,. Ltd.
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