Class AB CMOS output circuit equipped with CMOS circuit...

Details Class AB CMOS output circuit equipped with CMOS circuit... Class AB CMOS output circuit equipped with CMOS circuit...

2007-11-27

2007-11-27

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

Reexamination Certificate

active

11287469

ABSTRACT:
In a class AB CMOS output circuit provided with a CMOS circuit including first P and N channel transistors and operating by a predetermined operating current Io, a replica circuit is formed on a semiconductor substrate of the CMOS circuit, and includes a second P channel transistor having a size equal or similar to that of the first P channel transistor, and a second N channel transistor having a size equal or similar to that of the first N channel transistor. A bias voltage supply allows the second P and N channel transistors to operate based on a reference current Iref corresponding to the operating current Io, applies a first bias voltage as applied to the second P channel transistor to the first P channel transistor, and applies a second bias voltage as applied to the second N channel transistor to the first N channel transistor.

REFERENCES:
patent: 6411167 (2002-06-01), Laaser
patent: 6603356 (2003-08-01), Kim et al.
patent: 7078971 (2006-07-01), Colbeck
patent: 2002-521950 (2002-07-01), None
Matsuzawa,CMOS Operational Amplifier, The IEICE Transactions on Electronics (Electronics Society), published by the Institute of Electronics, Information and Communication Engineers (IEICE) in Japan, vol. J84-C, No. 5, pp. 357-373, May 2001; and partial English translation of same (2 pages).

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