SELF TEST OF IMAGE SIGNAL CHAIN WHILE RUNNING IN STREAMING MODE

摘要

An imager including a self test mode. The imager includes a pixel array for providing multiple pixel output signals via multiple columns; and a test switch for (a) receiving a test signal from a test generator and (b) disconnecting a pixel output signal from a column of the pixel array. The test switch provides the test signal to the column of the pixel array. The test signal includes a test voltage that replaces the pixel output signal. The test signal is digitized by an analog-to-digital converter (ADC) and provided to a processor. The processor compares the digitized test signal to an expected pixel output signal. The processor also interpolates the output signal from a corresponding pixel using adjacent pixels, when the test switch disconnects the pixel output signal from the column of the pixel array.

主权项

1. An imager including a self test mode comprising:
a pixel array for providing pixel output signals, a plurality of analog-to-digital converters (ADCs) for converting the pixel output signals into pixel digital data, a digital processor for processing the pixel digital data, and a multiplexer for receiving a test signal and the pixel digital data, wherein the multiplexer provides the test signal to the digital processor for testing the imager.