Patent ID: 6208152
Filing Date: 2001-03-27
Classification: G01R

Abstract:
A redundant resistor matching detector comprising:a voltage reference;a first operational amplifier and a second operational amplifier, said first operational amplifier having a first input connected to a first potentiometer, said second operational amplifier having a first input connected to a reference potentiometer, said first operational amplifier and said second operational amplifier having a reference input coupled to said voltage reference;an input current mirror coupled to said first potentiometer providing a first current;a first reference current mirror coupled to said reference potentiometer providing a reference current;a second reference current mirror having an input coupled to a first output of said first reference current mirror and having a first output coupled to an output of said input current mirror;a pair of series connected resistors connected between a second output of both said first reference current mirror and said second reference current mirror; anda resistor connected between a junction of said pair of series connected resistors and said first outputs of said input current mirror and said second reference current mirror.