Differential amplifier having a bias stabilizing circuit

Details Differential amplifier having a bias stabilizing circuit Differential amplifier having a bias stabilizing circuit

1991-08-21

1992-08-04

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, H03F 345

Patent

active

051362597

ABSTRACT:
A differential amplifier includes an input circuit outputting an input signal to be amplified, and a differential amplifier circuit having a first input terminal, a second input terminal, a first output terminal and a second output terminal. Complementary output signals are obtained at the first and second output terminals. An input bias circuit applies an input bias signal based on the input signal to the first input terminal of the differential amplifier circuit. A reference bias circuit applies a reference bias signal to the second input terminal of the differential amplifier circuit. A variation detecting circuit detects a variation in the input bias signal and generates a detection signal indicating a magnitude of the variation. A bias adjustment circuit adjusts the reference bias signal on the basis of the detection signal so that a difference between the input bias signal and the reference bias signal is always zero.

REFERENCES:
patent: 4425551 (1984-01-01), Blackner et al.
patent: 4575685 (1986-03-01), Dobkin et al.
patent: 4760286 (1988-07-01), Pigott
patent: 4843342 (1989-06-01), Hester et al.

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