Amplifiers – With semiconductor amplifying device – Including gain control means
Reexamination Certificate
2006-05-23
2006-05-23
Choe, Henry (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including gain control means
C330S296000
Reexamination Certificate
active
07049891
ABSTRACT:
A bias boost circuit is disclosed for use with an amplifier circuit for biasing thereof. The amplifier circuit includes at least a first transistor and a filter circuit for filtering of current pulses received from the bias boost circuit, where filtered current pulses form a variable bias current that is provided to the at least a first transistor. With this type of biasing circuit, large input signals that would normally compress the gain of the amplifier circuit are therefore amplified with less gain compression by virtue of the boost in bias current that is supplied to the at least a first transistor.
REFERENCES:
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patent: 5986509 (1999-11-01), Lohninger
patent: 6515546 (2003-02-01), Liwinski
patent: 6720831 (2004-04-01), Dening et al.
patent: 6794935 (2004-09-01), Klomsdorf et al.
patent: 2004/0000954 (2004-01-01), Kim et al.
patent: WO 01/43277 (2001-06-01), None
Choe Henry
Kenyon & Kenyon LLP
SiGe Semiconductor Inc.
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