Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1988-10-31
1989-09-19
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330267, 330296, 330277, H03F 326, H03F 316
Patent
active
048685186
ABSTRACT:
An amplifier circuit, for example, a class AB output stage, includes a series arrangment of a first transistor (T.sub.1) and a second transistor (T.sub.2), both arranged as diodes, a series arrangement of a third transistor (T.sub.3) and a fourth transistor (T.sub.4) and a series arrangement of a fifth transistor (T.sub.5) and an impedance (R). The first main electrode of the first transistor (T.sub.1) is coupled via the impedance (R) to the control electrode of the fourth transistor (T.sub.4). The first main electrodes of the second and fifth transistors (T.sub.2, T.sub.5) are coupled together and to the control electrode of the third transistor (T.sub.3). The control electrodes of the first, second and fifth transistors (T.sub.1, T.sub.2 and T.sub.5) are coupled together and to the second main electrodes of the first and the second transistor. This circuit provides a small quiescent current in the output transistors using relatively small input transistors (T.sub.1, T.sub.2) and relatively large output transistors (T.sub.3, T.sub.4).
REFERENCES:
patent: 4038607 (1977-07-01), Schade, Jr.
Tietze, V. and Schenk, Ch., Halbleiterschaltungstechnik, Springer Verlag, 1980, p. 350.
Gray, P. R. and Meyer, R. G., Analysis and Design of Analog ICs, John Wiley, New York, 1984, p. 410.
Blanken Pieter G.
De Boer Jan R.
Franzblau Bernard
Mottola Steven
U.S. Philips Corporation
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