Fully differential operational amplifier with D.C. common-mode f

Details Fully differential operational amplifier with D.C. common-mode f Fully differential operational amplifier with D.C. common-mode f

1985-04-29

1986-02-04

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, 330277, 330288, H03F 345, H03F 316

Patent

active

045688850

ABSTRACT:
A fully differential operational amplifier is provided having a common-mode feedback portion which accurately sets the common-mode output voltage at a predetermined value. The feedback portion utilizes a pair of parallel transistors which source a combined current which is used to provide a common-mode control voltage relative to a reference common-mode current. The common-mode control voltage controls load devices of the operational amplifier in a manner such that a differential output voltage remains centered about the predetermined common-mode output voltage.

REFERENCES:
patent: 4271394 (1981-06-01), Leidich
patent: 4272728 (1981-06-01), Wittlinger
patent: 4502019 (1985-02-01), Van Roermund

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