Gain control circuit and method

Details Gain control circuit and method Gain control circuit and method

1996-10-04

1998-09-22

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including gain control means

330288, 330254, H03G 330, H03F 345

Patent

active

058120297

ABSTRACT:
A circuit and method for controlling current gain in variable gain and automatic gain control amplifiers or attenuators in high frequency communication systems. A transistor through which the current is provided always operates at the same DC bias, independent of gain control variations. The input signal is provided to a base of the transistor whose collector provides an output current whose gain is to be controlled. An AGC current for adjusting the output current gain and a DC bias current are provided to the base of the transistor through a multi-transistor circuit so that the DC bias is independent of variation of the output current gain.

REFERENCES:
patent: 4814724 (1989-03-01), Tanigawa
patent: 4878031 (1989-10-01), Main
patent: 5424682 (1995-06-01), Gomez et al.

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