Power control circuit
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United States of America Patent
Stats
-
Aug 2, 1994
Grant Date -
N/A
app pub date -
Feb 23, 1993
filing date -
Mar 11, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A power control circuit for use in radio transmitters such as portable telephone sets includes a power amplifier for amplifying the power of a transmission signal to obtain an output signal; control circuits for controlling the amplitude of the signal output by the power amplifier; a limiter for partially limiting the amplitude of the signal from the power amplifier in order to obtain a limited signal; a multiplication circuit for multiplying the limited signal from the limiter and part of the signal from the power amplifier in order to acquire a multiplied signal; a low-pass filter for extracting a DC component of the multiplied signal from the multiplication circuit; and a comparison circuit for comparing the DC component from the low-pass filter with a reference voltage in order to obtain a comparison output. The comparison output from the comparison circuit is supplied to the control circuits, and the control circuits control the level of the signal from the power amplifier so that the DC component from the low-pass filter will become equal to the reference voltage regardless of temperature change.
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