Bias circuit

Details Bias circuit Bias circuit

1996-07-24

1998-06-09

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327435, 327109, G05F 110, H03K 17687

Patent

active

057640980

ABSTRACT:
To keep a constant gate bias voltage to prevent a saturation output power from being decreased even when a GaAs FET for power amplification is operated near the saturation region, current amplification of an output from an operational amplifier (23) is performed by a transistor (24), and a gate bias voltage (Vg) is supplied to the gate of a GaAs FET (1). The gate bias voltage (Vg) is fed back to one input terminal of the operational amplifier (23), and a voltage obtained through voltage-dividing resistors (21, 22) is supplied to the other input terminal so that the operational amplifier serves as a voltage follower.

REFERENCES:
patent: 4495471 (1985-01-01), Barrett
patent: 4539491 (1985-09-01), Nishioka et al.
patent: 5231316 (1993-07-01), Thelen, Jr.
patent: 5422593 (1995-06-01), Fujihira
patent: 5570060 (1996-10-01), Edwards
patent: 5578960 (1996-11-01), Matsumura et al.
patent: 5625312 (1997-04-01), Kawakami et al.
Jung, Op-Amp Applications, p. 170, pub. SAMS, Ed 3.

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