Low impedance read amplifier for magnetoresistive head

Details Low impedance read amplifier for magnetoresistive head Low impedance read amplifier for magnetoresistive head

2006-06-13

2006-06-13

Shingleton, Michael B (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C360S066000, C360S067000, C360S068000, C360S046000, C330S069000, C330S302000, C330S252000, C330S253000, C330S277000, C330S259000, C330S290000

Reexamination Certificate

active

07061321

ABSTRACT:
A read amplifier system for connection through interconnects to a magnetoresistive (MR) head includes two input transistors, two bias transistors connected to the two input transistors by common source connections, a bias voltage control circuit connected to base terminals of the two bias transistors, a common mode voltage control circuit connected between first and base terminals of the input transistors to provide feedback from the first terminals to the base terminals, and a compensating circuit connected between the outputs of the amplifier system and the base terminals of the input transistors for providing a feedback from the outputs to the base terminals. The two base terminals of the input transistors are respectively connected to the interconnects of the MR head. The bias voltage control circuit applies a bias voltage to base terminals of the two bias transistors, and through the common sources to the base terminals of the input transistors, and thereby across the MR head. An input signal representing changes in resistance of the MR head is transmitted from the MR head to the input transistors and is amplified by the read amplifier system.

REFERENCES:
patent: 3497824 (1970-02-01), Goordman
patent: 3582802 (1971-06-01), Weekes et al.
patent: 2004/0085667 (2004-05-01), Chung et al.

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