Patent ID: 6265905
Filing Date: 2001-07-24
Classification: G01R,H03F

Abstract:
A voltage-sensing preamplifier for use with a magnetoresistive (MR) sensor, the voltage-sensing preamplifier comprising:a gain stage including at least one input device, the at least one input device having a first input impedance, the at least one input device coupled with the MR sensor; anda control circuit coupled with the at least one input device, the control circuit providing at least one signal to the at least one input device, the at least one signal controlling the first input impedance of the at least one input device and a second input impedance of the voltage-sensing preamplifier, wherein the at least one input device is coupled with the MR sensor through an interconnect having a characteristic impedance and wherein the at least one signal controls the second input impedance of the voltage-sensing preamplifier to substantially match the characteristic impedance of the interconnect.