Patent ID: 9353017
Filing Date: 2016-05-31
CPC Classification: C05F,G05F,H03M,Y02A,Y02P

Claim Text:
1. An integrated circuit (IC), comprising: a current source that is trimmed in a trimming mode of operation in which the current source is connected to pass a current through a reference resistance of a test board of a tester and provide a corresponding measurement voltage; a reference voltage source for providing a reference voltage that is derived from a supply voltage of the tester; an on-chip analog-to-digital converter (ADC) for converting the reference voltage and the measurement voltage to a corresponding digital reference signal and a digital measurement signal respectively; a digital comparator for comparing the digital reference signal and the digital measurement signal, and providing a digital trim signal used to adjust the current from the current source until the digital measurement signal is equal to the digital reference signal, within an acceptable tolerance; and a change-over switch connected to a pin of the IC, wherein the reference resistance is external to the IC and connected to the IC through the pin, wherein the change-over switch connects the pin to the on-chip ADC during the trimming mode, and connects the pin to another block of the IC during normal operation of the IC.