US 12,326,526 B2
Balanced photodetector and methods thereof
Zhi Li, San Jose, CA (US); Jonathan Doylend, Morgan Hill, CA (US); Gregory Lovell, Santa Clara, CA (US); Aliasghar Eftekhar, Fremont, CA (US); and Srinivasan Sethuraman, San Jose, CA (US)
Assigned to Intel Corporation, Santa Clara, CA (US)
Filed by Intel Corporation, Santa Clara, CA (US)
Filed on Dec. 17, 2021, as Appl. No. 17/553,866.
Prior Publication US 2022/0146650 A1, May 12, 2022
Int. Cl. G01S 7/4914 (2020.01); G01S 7/497 (2006.01)
CPC G01S 7/497 (2013.01) [G01S 7/4914 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A balanced photodetector system comprising:
a balanced photodetector comprising a first photodiode and a second photodiode coupled with one another at a common node, wherein the first photodiode has a first effective responsivity and the second photodiode has as second effective responsivity, wherein the first effective responsivity comprises a first response function describing a first photocurrent that the first photodiode generates in response to incident light, wherein the second effective responsivity comprises a second response function describing a second photocurrent that the second photodiode generates in response to incident light; and
a control circuit configured to set an operating parameter of the balanced photodetector to compensate for a difference between the first effective responsivity and the second effective responsivity, wherein the operating parameter comprises a bias voltage supplied to the common node or a temperature of the balanced photodetector, wherein:
the control circuit is configured to adjust the bias voltage to the common node based on the difference between the first effective responsivity and the second effective responsivity; or
wherein the control circuit is configured to adjust the temperature of the balanced photodetector based on the difference between the first effective responsivity and the second effective responsivity.