Complementary push-pull amplifier device with protective circuit

Details Complementary push-pull amplifier device with protective circuit Complementary push-pull amplifier device with protective circuit

1975-05-21

1976-10-26

Miller, Jr., Stanley D.

Amplifiers

Miscellaneous

Amplifier protection means

330 17, H03F 2100

Patent

active

039886930

ABSTRACT:
In an amplifier device including a driving amplifier circuit and a push-pull output circuit, the push-pull output circuit consisting of a first amplifier portion which turns "on" when the drive current of the driving amplifier circuit decreases, and a second amplifier portion which turns "on" when the drive current increases, the improvement comprising the first protective circuit which is disposed on the input side of the first amplifier portion so as to branch an input current when the first amplifier portion falls outside its allowable operating range, and the second protective circuit which is disposed on the input side of the driving amplifier circuit so as to branch an input current when the second amplifier portion falls outside its allowable operating range, whereby even when the drive current of the driving amplifier circuit becomes large, the constituent parts of the push-pull output circuit can be reliably protected from being destroyed.

REFERENCES:
patent: 3445776 (1969-05-01), Leidich
patent: 3529254 (1970-09-01), Hill
patent: 3536958 (1970-10-01), Sondermeyer
patent: 3681659 (1972-08-01), Suzuki
patent: 3786364 (1974-01-01), Wheatley, Jr.
IBM Tech. Discl. Bulletin, vol. 14, No. 3, Aug. 1971, pp. 699-700 "Power Amplifier With Output Protection Circuit" by Lamoreaux.

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