Low voltage, beta immune variable gain amplifier with high suppl

Details Low voltage, beta immune variable gain amplifier with high suppl Low voltage, beta immune variable gain amplifier with high suppl

1998-06-30

1999-11-16

Lee, Benny

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, 3217359, H03F 345, G06F 744

Patent

active

059865016

ABSTRACT:
A variable gain amplifier includes a Gilbert cell multiplier cell having a pair of bipolar input transistors and a pair of bipolar output transistors. A bias circuit provides a first bias current to the input transistors and a second bias current to the output transistors, the ratio of the second to the first bias current determining the gain of the multiplier cell. The bias circuit couples the first and second bias currents to the emitters of the input and output transistors and references these currents to ground, which provides excellent supply rejection. Additionally, high beta immunity is achieved by increasing the ratio of the second bias current to the first bias current by subtracting a current from the first bias current substantially equal to the base currents of the output transistors.

REFERENCES:
patent: 3968453 (1976-07-01), Hongu et al.
patent: 5185581 (1993-02-01), Brown
patent: 5325070 (1994-06-01), McGinn
patent: 5475339 (1995-12-01), Maida
patent: 5483194 (1996-01-01), Genest

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