Transconductance amplifier having a digitally variable transcond

Details Transconductance amplifier having a digitally variable transcond Transconductance amplifier having a digitally variable transcond

1995-08-31

1997-09-16

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330282, 330288, H03F 345, H03G 330

Patent

active

056685017

ABSTRACT:
A transconductance amplifier having a digitally variable transconductance includes a differential stage having a first differential output coupled to an output terminal via a first current mirror and a second differential output coupled to the output terminal via a second and third current mirror. The first and third current mirrors have multiple output branches for selectively supplying output currents to the output terminal in response to a binary transconductance control signal. In this way a digital control of the variable transconductance is realised, which can be used advantageously in a variable gain stage and in an automatic gain control circuit including such a variable gain stage.

REFERENCES:
patent: 4361815 (1982-11-01), Schade, Jr.
patent: 5051707 (1991-09-01), Fujita
patent: 5327298 (1994-07-01), Molina et al.
IEEE Journal of Solid-State circuits, vol. SC-17, No. 3, Jun. 1982, p. 522.

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