US 12,068,723 B2
Direct current offset compensation circuit
Mehmet M. Eker, San Marcos, CA (US); Simon S. Pang, San Diego, CA (US); and Joseph J. Balardeta, Encinitas, CA (US)
Assigned to Cisco Technology, Inc., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Oct. 20, 2021, as Appl. No. 17/451,574.
Prior Publication US 2023/0122287 A1, Apr. 20, 2023
Int. Cl. H03F 3/08 (2006.01); H03F 3/45 (2006.01)
CPC H03F 3/087 (2013.01) [H03F 3/45475 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A differential transimpedance amplifier (DTIA) comprising:
a first input, a second input, a first output, and a second output;
a first inverter and a second inverter connected in series to the first input; and
a third inverter and a fourth inverter connected in series to the second input, wherein the first inverter and the fourth inverter are configured to receive a first supply voltage from a first voltage regulator, wherein the second inverter and the third inverter are configured to receive a second supply voltage from a second voltage regulator, and wherein the first supply voltage changes (i) based on a difference between voltages on the first output and the second output and (ii) while the second supply voltage remains fixed.