Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1987-09-14
1988-10-11
Wan, Gene
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330277, H03F 345
Patent
active
047774517
ABSTRACT:
To increase a voltage gain of a differential circuit, constant current source type FETs in which a source and a gate are short circuited are used as a load element and as a current source. A constant voltage type FET is used as a clamp to clamp the load element. Therefore, a temperature characteristic and a deterioration of an AC characteristic, which cause problems in a conventional diode clamp type differential circuit, can be improved.
REFERENCES:
patent: 3678407 (1972-07-01), Ahrons
patent: 3898477 (1975-08-01), Buchanan
patent: 3970951 (1976-07-01), Hoffman
patent: 4393315 (1983-07-01), Stickel et al.
patent: 4563654 (1986-01-01), Arai et al.
Patent Abstracts of Japan, vol. 10, No. 170 (E-412) [2226], Jun. 17, 1986; & JP-A-61 23403 (Hitachi Seisakusho Takashi Sase) 31-01-1986.
Fujitsu Limited
Wan Gene
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