Low-noise amplifier with switched gain and method

Details Low-noise amplifier with switched gain and method Low-noise amplifier with switched gain and method

1999-06-04

2000-11-07

Mottola, Steven J.

Amplifiers

Combined with automatic amplifier disabling switch means

330295, H03F 368

Patent

active

061442542

ABSTRACT:
A low noise radio frequency amplifier is switchable between a low gain state and a high gain state. A first, common-emitter transistor is active in the high gain state and inactive in the low gain state. The first transistor has a base coupled to a radio frequency input and a first bias input, an emitter coupled to ground, and a collector coupled to an amplified radio frequency output. A second, common-base transistor is active in the low gain state and inactive in the high gain state. The second transistor has an emitter coupled to the radio frequency input, a base coupled to a second bias input, and a collector coupled to the amplified radio frequency output.

REFERENCES:
patent: 3748588 (1973-07-01), Beurrier
patent: 4885550 (1989-12-01), Ferrer
patent: 5548246 (1996-08-01), Yamamoto et al.

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