Read/write circuit with switchable head resistance for read and

Details Read/write circuit with switchable head resistance for read and Read/write circuit with switchable head resistance for read and

1993-07-02

1994-10-18

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 62, G11B 509, G11B 1512

Patent

active

053573790

ABSTRACT:
A read/write circuit for a disk drive system with a two-terminal magnetic head, having an adjustable damping resistor across the magnetic head. A switch network connects across the magnetic head and controls a resistor network to obtain an optimum level of impedance across the magnetic head in both the read mode and the write mode. The circuit provides a lower and well-defined impedance across the magnetic head in the write mode for all operating voltages across the head. A clamp circuit operates to prevent the write current source from saturating to improve current switching speed in the write mode.

REFERENCES:
patent: 3618119 (1971-11-01), Rodinguez
A Wide-Band CMOS Read Amplifier for Magnetic Data Storage Systems by T-W Pan and Asad A. Abidi, IEEE Journal of Solid-State Circuits, vol. 27, No. 6, Jun., 1992.
VTC, Inc. Data Sheet for VM7200H date not avail.
Silicon Systems data sheet for SSI 32R202R/202IR Mar. 1991.

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