Amplifier with current mirror bias adjust

Details Amplifier with current mirror bias adjust Amplifier with current mirror bias adjust

2007-12-10

2009-06-09

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S257000, C330S267000

Reexamination Certificate

active

07545216

ABSTRACT:
An amplifier includes a differential amplifier stage, a voltage amplification stage and a power output stage. The bias level of the output stage is proportional to current through the voltage amplification stage. The voltage amplification stage includes a current mirror whereby controlled current through a first leg of the current mirror controls current through the remaining, second leg, which, in turn, determines the bias level of the power output stage. Control circuitry senses a parameter of the amplifier, such as DC bias or input signal level to generate a control signal which is applied to the first leg of the current mirror to thereby control bias level of the power output stage.

REFERENCES:
patent: 5642078 (1997-06-01), Navabi et al.
patent: 6215357 (2001-04-01), Sakurai
patent: 6377085 (2002-04-01), Giuroiu
patent: 7123095 (2006-10-01), Tsutsui et al.
patent: 7271662 (2007-09-01), Akamine et al.
patent: 7368992 (2008-05-01), Sandquist

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