Gain control circuit for low-noise amplifier

Details Gain control circuit for low-noise amplifier Gain control circuit for low-noise amplifier

1998-09-03

2000-05-16

Lee, Benny

Amplifiers

With semiconductor amplifying device

Including gain control means

330282, H03G 310

Patent

active

060642653

ABSTRACT:
The present invention relates to a gain control circuit for a low-noise amplifier. A gain control circuit of a 2-stage low-noise amplifier comprising an input stage noise matching circuit, an intermediate impedance matching circuit, a gain control circuit, and an output stage impedance matching circuit, said gain control circuit including: a feedback circuit connected to a transistor of second stage of the 2-stage low-noise amplifier, said feedback circuit detecting the amplified signal through the first stage and the second stage, and feeding the signal back through a switch circuit; and an attenuation circuit for compensating the harmonics of the input signal.

REFERENCES:
patent: 4348643 (1982-09-01), Tennyson
patent: 5408198 (1995-04-01), Kusunoki
patent: 5532646 (1996-07-01), Aihara
patent: 5742206 (1998-04-01), Ishida

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