Low power radio frequency transmitter with controllable gain
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United States of America Patent
Stats
-
Jul 22, 2003
Grant Date -
Mar 7, 2002
app pub date -
Dec 14, 1998
filing date -
Dec 14, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A low power transmitter useful for vehicle remote keyless entry systems, for example, includes a transmitter circuit portion and a gain control circuit portion. The gain control circuit portion preferably includes an inductive load that introduces a resonant frequency that provides radio frequency gain control. The transmitter circuit portion preferably includes a transistor having a collector node and an emitter node. The gain controller circuit preferably includes a capacitive load coupled between the emitter node and the collector node of the transistor. The inductive load preferably is coupled between the emitter node of the transistor and ground.
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