Patent ID: 8717051
Filing Date: 2014-05-06
Classification: G01R,H03F,Y10S

Abstract:
1. A method for measuring a load current with an on-chip resistor, the method comprising: generating an output voltage proportional to the load current flowing through the on-chip resistor; generating a control signal indicative of a resistance value of a replica resistor by causing a desired full-scale current to flow through the replica resistor, and comparing a voltage across the replica resistor with a desired full-scale voltage; and utilizing the control signal, adjusting the output voltage to account for a change in a resistance value of the on-chip resistor; wherein, a temperature coefficient of the replica resistor is substantially similar to a temperature coefficient of the on-chip resistor, the resistance value of the replica resistor varies in proportion with the resistance value of the on chip resistor, and the adjusted output voltage indicates a measure of the load current through the on-chip resistor.