US 6,982,403 B2
Method and apparatus kTC noise cancelling in a linear CMOS image sensor
Hongli Yang, Cupertino, Calif. (US); Xinping He, San Jose, Calif. (US); and Qingwei Shan, San Jose, Calif. (US)
Assigned to OmniVision Technologies, Inc., Sunnyvale, Calif. (US)
Filed on Mar. 27, 2002, as Appl. No. 10/109,390.
Prior Publication US 2003/0183745 A1, Oct. 02, 2003
Int. Cl. H01L 27/00 (2006.01)
U.S. Cl. 250—208.1 10 Claims
OG exemplary drawing
 
1. A method of reading out a pixel signal from a pixel comprising:
capturing a first black reference signal from said pixel prior to said pixel starting an integration period;
after completion of said integration period, capturing a pixel signal;
capturing a second black reference signal following completion of said integration period; and
outputting said first black reference signal, said second black reference signal, and said pixel signal and using both said first black reference signal and said second black reference signal to modify said pixel signal.