Low-noise amplifier and circuit for controlling the same

Details Low-noise amplifier and circuit for controlling the same Low-noise amplifier and circuit for controlling the same

1999-03-18

2000-11-07

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

330298, 455 78, H03F 304

Patent

active

061442593

ABSTRACT:
A circuit for controlling a low-noise amplifier includes a low-noise transistor as an amplifying device. A bias voltage controller decreases a voltage to be applied to a gate of the transistor down to a voltage equal to or smaller than a pinch-off voltage to thereby pinch-off the low-noise amplifier, while power to be provided to the low-noise amplifier is kept off. In accordance with the circuit, even if an excessive input signal is input into the low-noise amplifier while the low-noise amplifier is not in operation, a gate current does not run through a transistor constituting the low-noise amplifier. Hence, it is possible to prevent destruction of a device and reduction in reliability of a device. In other words, the circuit operates as a circuit for protecting a device.

REFERENCES:
patent: 4637073 (1987-01-01), Selin et al.
patent: 4656653 (1987-04-01), Oda et al.
patent: 4907291 (1990-03-01), Yamamoto
patent: 5678199 (1997-10-01), Birth et al.
patent: 5729572 (1998-03-01), Oh
patent: 5808515 (1998-09-01), Tsuruoka et al.
patent: 5812612 (1998-09-01), Saito
patent: 5815821 (1998-09-01), Pettersson
patent: 5986503 (1999-11-01), Ichikawa
Japanese Office Action issued Mar. 1, 2000 in a related application with English translation of relevant portions.
U.K. Search/Examination Report issued Jul. 15, 1999 in a related application.

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