Patent ID: 7634376
Filing Date: 2009-12-15
Classification: G01R,G09G

Abstract:
1. A method of testing an imager comprising a pixel array and an analog-to-digital converter, the method comprising: transmitting a control signal from a test station to the imager; decoupling the analog-to-digital converter from the pixel array; selectively coupling a first of at least two analog reference signal lines to the analog-to-digital converter responsive to the control signal; transmitting a digital value derived from the coupled analog reference signal line to the test station; comparing the digital value to a target value corresponding to the coupled analog reference signal line; selectively coupling a second of the at least two analog reference signal lines to the analog-to-digital converter and repeating the transmitting and comparing steps; and programming the imager with a trim setting selected based on a result of the comparisons.