Amplifier bias enhancement technique

Amplifiers – With semiconductor amplifying device – Including gain control means

Reexamination Certificate

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Details

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:
patent: 5808515 (1998-09-01), Tsuruoka et al.
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

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