US 11,990,879 B2
Fully-differential amplifier with input common-mode voltage control
Joel Martin Halbert, Tucson, AZ (US); and Xiyao Zhang, Tucson, AZ (US)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by Texas Instruments Incorporated, Dallas, TX (US)
Filed on May 11, 2021, as Appl. No. 17/316,775.
Claims priority of provisional application 63/022,743, filed on May 11, 2020.
Prior Publication US 2021/0351752 A1, Nov. 11, 2021
Int. Cl. H03F 3/45 (2006.01)
CPC H03F 3/45475 (2013.01) [H03F 2200/129 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An amplifier comprising:
a differential amplifier including differential inputs; and
a common-mode input voltage control circuit including:
an error amplifier including:
a first input coupled to at least one of the differential inputs;
a second input adapted to be coupled to a target common-mode input voltage (VICM); and
an output coupled to the differential inputs; and
a first buffer amplifier including:
an input coupled to a first of the differential inputs; and
an output coupled to the first input of the error amplifier.