Signal amplifier apparatus and magnetic disk storage apparatus u

Details Signal amplifier apparatus and magnetic disk storage apparatus u Signal amplifier apparatus and magnetic disk storage apparatus u

1998-11-02

2000-09-05

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330253, 360 46, 360 67, H03F 345, G11B 509, G11B 502

Patent

active

061149055

ABSTRACT:
A very-small-signal amplifier is capable of amplifying very small signals with high sensitivity up to high frequencies while simplifying the circuit, and a magnetic disk storage apparatus realizes a reading operation over a wide band up to high frequencies with high sensitivity. The signal amplifier is a modified differential circuit including a first transistor of a first conductivity type and a second transistor of a second conductivity type each having a control terminal, a terminal of the input side and a terminal of the output side. The terminals on the input side are connected in common, and a current corresponding to the voltage difference across the control terminals is allowed to flow. A very small voltage signal generated by an input signal source is applied to the control terminal of said first transistor. A bias voltage is applied to the control terminal of the second transistor. Therefore, an amplified signal corresponding to the very small voltage signal generated by the input signal source is generated at the terminal on the output side of the second transistor.

REFERENCES:
patent: 4881043 (1989-11-01), Jason
patent: 5323278 (1994-06-01), Contreras et al.
patent: 5712739 (1998-01-01), Nakamura et al.
IEEE Journal of Solid-State Circuits, vol. 29, No. 2, Dec. 1994, "A 0.8nV/ Hz CMOS Preamplifier for Magneto-REsistive Read Elements", Hans W. Klein et al, pp. 1589-1595.

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