Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1996-06-26
1998-05-26
Mottola, Steven J.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330260, H03F 345
Patent
active
057572321
ABSTRACT:
A high-impedance circuit includes a differential pair circuit composed of a first transistor and a second transistor, and a buffer circuit. The buffer circuit includes an NPN type transistor pair composed of a cascade connection of NPN type transistors and a PNP type transistor pair composed of a cascade connection of PNP type transistors, and bases of the NPN type transistors and bases of PNP type transistors respectively corresponding to the NPN type transistors are connected to each other, respectively so as to constitute current mirror circuits. An output of the differential pair circuit is connected to a cascade connection point of the NPN type transistor pair, and an emitter of an NPN type transistor included in the NPN type transistor pair is connected to the ground via a constant current source, and the emitter is connected to bases of the first transistor and the second transistor via resistors, respectively. Therefore, the output of the differential pair circuit is fed-back to inputs of the differential pair circuit, i.e. the bases of the first transistor and the second transistor as base currents.
REFERENCES:
patent: 3996609 (1976-12-01), Avery
patent: 4380739 (1983-04-01), Velo
patent: 4513242 (1985-04-01), Yokogawa
patent: 5012201 (1991-04-01), Morita et al.
patent: 5157322 (1992-10-01), Llewellyn
patent: 5266852 (1993-11-01), Shigenari et al.
patent: 5381106 (1995-01-01), Limberg
Patent Abstract of Japan, vol. 8, No. 29 (E-226) dated Feb. 7, 1984, titled Sound Multiplex Signal Receiver (of JP 58 191578, published Nov. 8, 1983).
Patent Abstract of Japan, vol. 9, No. 234 (E-344) dated Sep. 20, 1985, titled Floating High Impedance Circuit (of JP 60 089117, published May 20, 1985).
European Search Report dated Nov. 6, 1995, Ref No. cv-FP-0604 citing above listed references.
Mottola Steven J.
Sanyo Electric Co.
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