Temperature compensated bias network for a power amplifier and method of operation
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United States of America Patent
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Apr 10, 2001
Grant Date -
N/A
app pub date -
Sep 16, 1999
filing date -
Sep 16, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There is disclosed, for use in an RF amplifier, a biasing circuit for maintaining the quiescent current of an output power transistor at a selected bias level. The biasing circuit comprises a temperature sensor circuit for generating a temperature-sensitive control voltage that varies according to changes in temperature of the output power transistor and a bias voltage generating circuit capable of detecting a variation in the temperature-sensitive control voltage. In response to a detected change in the temperature-sensitive control voltage, the bias circuit adjusts a bias voltage applied to the output power transistor by an amount suitable to offset a change in the selected bias current level caused by a temperature change related to the variation in the temperature-sensitive voltage.
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