Patent ID: 8779796

Claim:
A device parameter test circuit comprising: an operational amplifier having a first differential input at a first node, a second differential input at a second node, and an output at a third node, the first node being coupled to a reference voltage; a first switch external to the operational amplifier configured to selectively couple the second node to the third node to feedback the output of the operational amplifier directly to the second differential input of the operation amplifier; a second switch configured to selectively couple the second node to a fourth node; a constant current source coupled to the fourth node; and a third switch configured to selectively couple the fourth node to a first voltage supply node; wherein the device parameter test circuit is configured through selective triggering of the switches to measure a selected parameter from a plurality of parameters of a device coupled to the device parameter test circuit, and wherein the third node is different than the fourth node and corresponds to a first terminal of the device and the fourth node corresponds to a second terminal of the device.