Circuit for compensating temperature of automatic gain control circuit
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United States of America Patent
Stats
-
Sep 6, 2005
Grant Date -
Dec 12, 2002
app pub date -
Jun 10, 2002
filing date -
Jun 11, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A circuit for compensating temperature of an automatic gain control (AGC) circuit includes a low noise amplifier (LNA) for amplifying a received radio frequency (RF) signal, an attenuation control unit for generating an attenuation control signal by sensing the amplified RF signal, and a PIN diode attenuator for attenuating the RF signal inputted to the LNA by driving the PIN diode with an attenuation control signal. A temperature compensation unit for compensating an attenuation change amount of the PIN diode caused by the change of temperature compensates the voltage change between the PIN diodes by using an additional PIN diode having identical characteristic of temperature as the PIN diode of the PIN diode attenuator.
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