Variable gain amplifier having n parallel-connected elementary a

Details Variable gain amplifier having n parallel-connected elementary a Variable gain amplifier having n parallel-connected elementary a

1994-12-08

1996-06-25

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including gain control means

230295, H03G 310

Patent

active

055304044

ABSTRACT:
A variable gain amplifier which has n parallel-connected elementary amplifiers, and components for selecting j-order (j=1, 2, . . . , n) elementary amplifier according to the desired gain. Each elementary amplifier is of a common base type. The variable gain amplifier includes components that are used to obtain a low value input impedance that is independent of the gain of the selected elementary amplifier. The variable gain amplifier will find particular application at the input stages of amplification lines of receiving circuits which require noise performance characteristics.

REFERENCES:
patent: 4462003 (1984-07-01), Takanatsu

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