Miscellaneous active electrical nonlinear devices – circuits – and – External effect – Magnetic
Patent
1996-02-06
1997-05-06
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
External effect
Magnetic
327509, 327530, H03K 345
Patent
active
056274904
ABSTRACT:
An amplifier circuit for amplifying a change in a resistance value of a magnetic resistance element is formed by connecting a first and a second current mirror circuits having the same structure in cascode, so that a voltage change is amplified without using a capacitive coupling. Hence, a high-pass filter is not created as a parasitic circuit, whereby a gain is maintained high in the low frequency region and a low frequency characteristic is excellent. Further, since control electrodes of transistors which form each current mirror circuit are grounded through the capacitance, a noise is reduced without using a conventional feedback circuit. This eliminates an influence of the feedback circuit over a high frequency characteristic, and therefore, a high frequency characteristic becomes excellent.
REFERENCES:
patent: 4495425 (1985-01-01), McKenzie
patent: 5175489 (1992-12-01), Mizuide
patent: 5440224 (1995-08-01), Kimura
patent: 5444363 (1995-08-01), Cabler
patent: 5448159 (1995-09-01), Kojima et al.
patent: 5543746 (1996-08-01), Kuo
Imanishi Ikuo
Ishida Kenichi
Kishimoto Michinori
Nakamura Tsuyoshi
Sushihara Koji
Matsushita Electric - Industrial Co., Ltd.
Tran Toan
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