Patent ID: 7154291
Filing Date: 2006-12-26
Classification: G01R

Abstract:
1. An apparatus for measuring current in a field-effect transistor, comprising: means for measuring a drain-to-source voltage of the field-effect transistor ( means for compensating the drain-to-source voltage for a temperature of the field-effect transistor; means for generating an output representative of a direction of a flow of current through the field-effect transistor and a level of the current through the field-effect transistor, wherein the measuring means further comprises a differential amplifier coupled to the field-effect transistor and receiving a signal indicative of the drain-to-source voltage of the field-effect transistor; and biasing means coupled to the differential amplifier for biasing an output voltage of the differential amplifier, wherein the generating means further comprises an inverting amplifier receiving the output voltage of the differential amplifier.