Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1995-09-29
1997-06-24
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330254, 330255, 330259, H03F 345, H03G 330
Patent
active
056420781
ABSTRACT:
An amplifier having an inverting and a non-inverting input and at least one output is compensated by dynamically varying the transconductance of a gain stage in accordance with the gain of the output stage of the amplifier. The amplifier comprises a gain section having at least one output, where a gm of the gain section varies with a transconductance control signal. The amplifier further comprises an output stage comprising a output drive device controlled by an output of the gain section. A bias control circuit is coupled to drive the transconductance control input of the gain section, the bias control circuit increasing a differential mode transconductance of the first gain stage when the active pullup or pulldown output drive device has low gain.
REFERENCES:
patent: 4316149 (1982-02-01), Yamaguchi
patent: 4833423 (1989-05-01), Molloy
patent: 4857861 (1989-08-01), Seevinck et al.
patent: 4963837 (1990-10-01), Dedic
patent: 5117200 (1992-05-01), Scott, III
patent: 5157349 (1992-10-01), Babanezhad
"A Low-Output-Impedance Fully Differential Op Amp with Large Output Swing and Continuous-Time Common-Mode Feedback" by Joseph N. Babanezhad, IEEE Journal of Solid-State Circuits, vol. 26, No. 12, Dec. 1991.
Navabi Mohammad J.
Scott, III Baker P. L.
Barton Steven K.
Crystal Semiconductor Corporation
Mallinckrodt Robert R.
Mullins James B.
Violette J. P.
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