Power detector that employs a feedback circuit to enable class B operation of a detector transistor
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United States of America Patent
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Apr 4, 1995
Grant Date -
N/A
app pub date -
Sep 16, 1992
filing date -
Sep 19, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A power detector for detecting the magnitude of a radio frequency (RF) signal comprises a detector transistor (V1) which provides an output signal (DC-OUT) in dependence upon the input RF signal. The detector transistor is biased with a biasing circuit which comprises two transistors (V2,V3) in a feedback loop coupled to the base of the detector transistor (V1). The detector can be used as both current and voltage amplifier. One of the transistors (V3) in the feedback loop provides temperature compensation.
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