MR head preamplifier with output signal amplitude which is indep

Details MR head preamplifier with output signal amplitude which is indep MR head preamplifier with output signal amplitude which is indep

1997-05-09

1999-06-22

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

External effect

Temperature

327 65, 327563, H01L 3500, G06G 712

Patent

active

059146303

ABSTRACT:
A preamplifier circuit, which produces an output signal representative of signals from a magnetoresistive read head, includes a current bias circuit for providing a bias current to the read head, and first and second amplifiers for amplifying signals from the read head. The first amplifier, with an input for coupling to the read head, outputs first signals representative of changes in head resistance. The first signals have an amplitude substantially independent of the head resistance and proportional to a temperature dependent characteristic of the first amplifier. The second amplifier, which is coupled to the first amplifier, outputs a second signal having an amplitude proportional to the amplitude of the first signals and inversely proportional to the temperature dependent characteristic. Thus, the amplitude of the second signal is substantially independent of head resistance and the temperature dependent characteristic.

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