Patent ID: 9733276
Date: 2017-08-15
CPC Classifications: G01R,H03F

Claim:
1. A system for measuring high power currents, comprising: a low power transistor that is a scaled replica of a high power transistor of a high power driver; a first regulation transistor connected in series with the low power transistor; a multiplexer including a first input configured to receive a voltage signal from the low power transistor, a second input configured to receive a voltage signal from the high power transistor, a third input configured to receive a chop signal, and two outputs, wherein the multiplexer is configured to output the first input voltage signal and the second input voltage signal on the two outputs based upon the chop signal; a regulation amplifier with two inputs connected to the first and second outputs of the multiplexer and an output connected to a gate of the first regulation transistor; a current mirror with an input connected to the first regulation transistor and an output; a sensing resistor connected to the output of the current mirror; a voltage detector configured to detect a voltage across the sensing resistor and configured to produce an output that indicates a current output by the high power transistor, wherein the voltage detector has an input configured to receive the chop signal.