Voltage bias, current sense preamplifier for a magnetoresistive

Details Voltage bias, current sense preamplifier for a magnetoresistive Voltage bias, current sense preamplifier for a magnetoresistive

1999-04-02

2000-11-21

Le, Dinh T.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Nonlinear amplifying circuit

327 65, 327538, 327307, 360 68, 330259, G06G 712

Patent

active

061508764

ABSTRACT:
A preamplifier system for receiving information from at least one magnetoresistive head cell and for supplying a signal to circuitry external to the preamplifier system is disclosed. The preamplifier system includes a bias current generator, a first preamplifier gain stage, and a second preamplifier gain stage. The bias current generator is connected between a first potential and the magnetoresistive head cell for providing a bias current to the magnetoresistive head cell. The first and second preamplifier gain stages include multiple transistors, resistors, capacitors, and current sources. The combination of first and second preamplifier gain stages provide the proper amplification of a signal received from the head cell while eliminating an unwanted DC offset signal.

REFERENCES:
patent: 5434717 (1995-07-01), Yoshinaga et al.
patent: 5534818 (1996-07-01), Peterson
patent: 5914630 (1999-06-01), Peterson

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