Transmission circuit with improved gain control loop
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United States of America Patent
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Aug 19, 1997
Grant Date -
N/A
app pub date -
Nov 18, 1994
filing date -
Nov 19, 1993
priority date (Note) -
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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.
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