High output current wideband output stage/buffer amplifier

Details High output current wideband output stage/buffer amplifier High output current wideband output stage/buffer amplifier

2006-09-05

2006-09-05

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

C330S263000, C330S288000

Reexamination Certificate

active

07102440

ABSTRACT:
A high output current wideband output stage/buffer amplifier that has reduced quiescent current requirements. The output stage/buffer amplifier includes a diamond follower circuit having a pair of complementary output load-driving bipolar junction transistors (BJTs), a pair of pre-driver BJTs, and a plurality of current boost BJTs. As the base current of one of the driver transistors starts to increase in response to an increasing load current, the current through a corresponding pre-driver transistor decreases, thereby increasing the collector current of a corresponding boost transistor. The increased collector current of the boost transistor is fed back to a current mirror, causing a concomitant increase in the base current of the driver transistor.

REFERENCES:
patent: 5323122 (1994-06-01), Bowers
patent: 5736902 (1998-04-01), Graeme
patent: 5786729 (1998-07-01), Smith
patent: 5786731 (1998-07-01), Bales
patent: 5939944 (1999-08-01), Gibson
patent: 6501334 (2002-12-01), Corsi et al.
patent: 6586998 (2003-07-01), Moraveji

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