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Technical Examples
An apparatus and method for on-chip bias measurement of an analog signals on an integrated circuit with a switchable analog-to-digital converter capable of performing testing and other types of processing. Analog signal test locations are selected for testing by a test input selector which is in turn controlled by a controller on an integrated circuit, such as an imager chip. Test locations are connected to one or more analog-to-digital converters through the test input selector. The analog-to-digital converter(s) output a test measurement digital output to either test equipment or an on-chip calibration circuit. Test equipment or on-chip calibration circuits adjusts imager component bias or other operating parameters used in chip or device operation based on output from the analog-to-digital converter(s).