Electric circuit fabricated from magneto-resistive elements and

Details Electric circuit fabricated from magneto-resistive elements and Electric circuit fabricated from magneto-resistive elements and

1992-06-09

1992-12-01

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

307309, 330146, H03F 345

Patent

active

051682443

ABSTRACT:
A differential amplifier circuit comprises a current mirror circuit associated with an electric power source, and an amplifier circuit for developing differential voltage produced between a pair of output nodes of the current mirror circuit, and the current mirror circuit is implemented by a first series combination of a first magneto-resistive element, a first bipolar transistor and a second magneto-resistive element and a second series combination of a third magneto-resistive element, a second bipolar transistor and a fourth magneto-resistive element, wherein the first to fourth magneto-resistive elements are arranged in such a manner that variation of magnetic field has the same influence on the first and fourth magneto-resistive elements and on the second and third magneto-resistive elements so that the characteristics of the current mirror circuit is hardly affected by fluctuation of device characteristics of either first or second bipolar transistor.

REFERENCES:
patent: 3708700 (1973-01-01), Moser

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