Digitally controlled variable gain circuit

Details Digitally controlled variable gain circuit Digitally controlled variable gain circuit

1995-02-27

1996-06-04

Mullins, James B.

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

330144, 330282, 330284, 333 81R, H03F 134, H03G 330

Patent

active

055237215

ABSTRACT:
A digitally controlled variable gain circuit which receives an analog input voltage and produces an analog output voltage. The digitally controlled variable gain circuit includes a first resistor string having first and second ends and a plurality of resistors connected in series between the first and second ends, the second end of the first resistor string being grounded and the analog input voltage being applied across the first and second ends of the first resistor string. A first selection mechanism, coupled to the first resistor string and responsive to a first digital control signal, provides a selectively determinable voltage divided output from the first resistor string. A second resistor string has first and second ends and a plurality of resistors connected in series between the first and second ends, the second end of the second resistor string being grounded and the voltage divided output provided by the first selection mechanism being applied across the first and second ends of the second resistor string. A second selection mechanism, coupled to the second resistor string and responsive to a second digital control signal, provides a selectively determinable voltage divided output from the second resistor string as the analog output voltage.

REFERENCES:
patent: 5165099 (1992-11-01), Onaya et al.
patent: 5216355 (1993-06-01), Terada et al.
patent: 5339021 (1994-08-01), Thomson

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