National Semiconductor Corporation

Kunhong Qu

William David Llewellyn

Mehmet Aslan

David Michael Boisvert

Ha Chu Vu

Seema Varma

Chungwai Benedict Ng

Nghiem Nguyen

Chung Wai Ng

Calibrating a white level in an image scanning device. A target white level is accessed. A high white level is determined for pixel data output by an amplifier. A gain adjustment to the amplifier is determined to correct a portion of an error between the target white level and the high white level. The gain adjustment is applied to the amplifier.

Method and device for white level calibration

An analog front-end (AFE) circuit may include a correlated double sampler (CDS) with a ping-pong architecture, and a ping-pong mismatch correction circuit. The CDS employs a ping data path during ping phases, and employs a pong data path during pong phases. The ping-pong mismatch correction circuit is arranged to correct a mismatch between a gain that is associated with the ping data path and a gain that is associated with the pong data path. Further, the ping-pong mismatch correction circuit is arranged to correct a mismatch between an offset that is associated with the ping data path and an offset that is associated with the pong data path.

Apparatus and method for ping-pong mismatch correction

Growing community of inventors

San Jose, CA, United States of America

Kunhong Qu