Load-invariant amplifier

Details Load-invariant amplifier Load-invariant amplifier

2005-02-15

2008-05-06

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

C330S265000, C330S268000, C330S274000

Reexamination Certificate

active

07368992

ABSTRACT:
A push-pull amplifier having low output impedance and low crossover distortion is provided. A least one of a current through a sourcing current path of an output stage and a current through a sinking current path of the output stage is determinative of a quiescent current control signal produced for controlling a quiescent current of the amplifier. The quiescent current is controlled by symmetrically controlling a bias voltage applied to a sourcing active output device and a bias voltage applied to a sinking active output device in response to the quiescent current control signal. An output stage sourcing control signal for controlling the sourcing active output device is referenced directly to a shared terminal of the sourcing active output device, and an output stage sinking control signal for controlling the sinking active output device is referenced directly to a shared terminal of the sinking active output device.

REFERENCES:
patent: 3852678 (1974-12-01), Frye
patent: RE29273 (1977-06-01), Reiffin
patent: 4728903 (1988-03-01), Reiffin
patent: 4866398 (1989-09-01), Gulczynski
patent: 5361041 (1994-11-01), Lish
patent: 5512857 (1996-04-01), Koskowich
patent: 6414549 (2002-07-01), Barbetta
patent: 0684698 (1995-11-01), None

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