Patent ID: 6215302
Filing Date: 2001-04-10
Classification: G01R,G11B,H03F

Abstract:
A circuit for measuring resistance of a resistive transducer while the transducer is biased for normal operation by transducer biasing circuitry, said circuit comprising:a preamplifier having input terminals, wherein the preamplifier is configured to generate a preamplified signal indicative of potential difference across the transducer when the input terminals are coupled across the transducer and the transducer is biased for normal operation;transducer current circuitry having at least one input, wherein the transducer current circuitry is configured to generate a first signal having an amplitude indicative of current through the transducer when the at least one input is coupled to the transducer biasing circuitry and the transducer is biased for normal operation; andresistance measurement circuitry having a first input and at least one other input, the first input coupled to receive the first signal, and the at least one other input coupled to receive at least one signal indicative of the potential difference across the transducer when the transducer is biased for normal operation, wherein the resistance measurement circuitry includes analog divider circuitry configured to generate from the first signal and the at least one signal, a third signal indicative of the resistance of the transducer when said transducer is biased for normal operation.