Low voltage class AB amplifier

Details Low voltage class AB amplifier Low voltage class AB amplifier

1996-08-19

1998-10-20

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330264, 330267, 330270, H03F 330, H03F 345

Patent

active

058252460

ABSTRACT:
The amplifier (200) includes an input stage (220) coupled to two output transistors (281, 282) having a common terminal at the output terminal (206) of the amplifier. Class AB operation of the output transistors (281, 282) is possible at a comparatively low supply voltage. In order to obtain such operation, measurement transistors (271, 272) are coupled to the same control input (283, 284) as the output transistors (281, 282). These measurement transistors (271, 272) are serially coupled to a current mirror (260). The quiescent current of the output transistors (281, 282) is measured and used to produce a feedback signal which is superimposed to the control signals.

REFERENCES:
patent: 4570128 (1986-02-01), Monticelli
patent: 4853645 (1989-08-01), Seevinck et al.
patent: 4857861 (1989-08-01), Seevinck et al.
patent: 4963837 (1990-10-01), Dedic
patent: 5485123 (1996-01-01), Kiehl
E. Seevinck, W. de Jager, and P. Buitendijk, "A low-distortion output stage with improved stability for monolithic power amplifiers," IEEE J. Solid-State Circuits, vol. SC-23, pp. 794-801, Jun. 1988.
M. Ismail, "Analog VLSI, Signal and Information Processing", McGraw-Hill, 1994, (ISBN 0-07-032386-0), pp. 142-143.
Horowitz, P., Hill, W.: "The Art of Electronics", Second Edition, Cambridge University Press 1989, ISBN 0-521-37095-7, chapter 2.14 Current Mirrors on pp. 88-91.
Wai-Kai Chen (Editor): "The Circuits and Filters Handbook", CRC Press, IEEE Press, ISBN 0-8493-8341-2, chapter 57.1 Biopolar Biasing Circuits on pp. 1619-1628, 1995.

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