Dynamically biased amplifier
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United States of America Patent
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-
Jan 11, 1994
Issued Date -
N/A
app pub date -
Mar 16, 1993
filing date -
Dec 17, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An amplifier (102) which can be dynamically biased is disclosed. A controller (118) determines when to change the bias to the amplifier (102), in order to achieve low frequency splatter. This is accomplished by changing the bias level of amplifier (102) between a substantially linear (class A) mode of operation, and a substantially nonlinear (class B) mode of operation. During the critical periods when the amplifier (102) is being turned into and out of operation, the amplifier (102) is placed in a substantially linear mode of operation, thereby reducing the output harmonics which develop. In another aspect of the invention a radio 300 which employs a dynamically biased amplifier (102) is disclosed.
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