Semiconductor integrated circuit and magnetic storage device...

Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of the amplifier

Reexamination Certificate

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Reexamination Certificate

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07046468

ABSTRACT:
The present invention provides a semiconductor integrated circuit capable of reducing a circuit area and a magnetic storage device using the same. The circuit in the present invention is provided with a single-stage output transistor for supplying write current to a magnetic head, a current source for outputting reference current of the write current, a diode-connected NMOS transistor for converting the current to gate voltage and having a certain device size ratio to the output transistor, a regulator circuit for transmitting gate voltage of the NMOS transistor and reducing output impedance, and a CMOS circuit for setting power supply voltage to an output of the regulator circuit and controlling the gate voltage of the output transistor. Then, this circuit is applied as a write circuit in a magnetic storage device.

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2000 IEEE International Solid-State Circuits Conference Digest of Technical Papers, “A 550 Mb/s GMR Read-Write Amplifier Using 0.5um 5 V CMOS Process”, Lam et al, pp. 358-359.

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