Dynamically biased amplifier

Details Dynamically biased amplifier Dynamically biased amplifier

H - Electricity

03

F

H03F 1/00 (2006.01) H03F 1/02 (2006.01) H03F 3/72 (2006.01) H03G 3/30 (2006.01) H04B 1/04 (2006.01) H04B 1/16 (2006.01)

Patent

CA 2097057

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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