Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1999-12-01
2000-12-19
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330253, 360 46, 360 68, H03F 345, G11B 509, G11B 502
Patent
active
06163218&
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: 4453092 (1984-06-01), Joseph
patent: 4881043 (1989-11-01), Jason
patent: 5010303 (1991-04-01), Braun
patent: 5323278 (1994-06-01), Contreras et al.
patent: 5483196 (1996-01-01), Ramet
patent: 5712739 (1998-01-01), Nakamura et al.
H.W. Klein et al, "A 0.8nV/Hz CMOS Preamplifier for Magneto-Resistive Read Elements", IEEE Journal of Solid-State Circuits, vol. 29, No. 2, Dec. 1994, pp. 1589-1595.
Hashimoto Takashi
Hatanaka Noriaki
Mochizuki Tatsuo
Nagaya Yuji
Sonoyama Katsuya
Hitachi , Ltd.
Hitachi Information Technology Co., Ltd.
Hitachi ULSI Systems Co. Ltd.
Nguyen Patricia T.
Pascal Robert
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