Magnetic head write amplifier including current mirrors and swit

Details Magnetic head write amplifier including current mirrors and swit Magnetic head write amplifier including current mirrors and swit

1995-06-09

1997-09-16

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

330146, 327 53, 327 55, 327 66, G11B 509

Patent

active

056686765

ABSTRACT:
An apparatus for recording on a magnetic record carrier includes a write amplifier comprising four current mirrors which are turned on two at a time by two switchable floating current sources connected between the input terminals of the current mirrors in order to produce a write current of alternating polarity through a write head. The high impedance at the terminals of the write head enables the common-mode voltage across the write head to be fixed at any desired voltage value by means of a common-mode circuit. The symmetrical structure further enables the parasitic capacitances at the write terminals to be neutralized by means of neutralizing capacitors.

REFERENCES:
patent: 4551772 (1985-11-01), Sliger
patent: 5282094 (1994-01-01), Ngo
patent: 5287231 (1994-02-01), Shier et al.
patent: 5296975 (1994-03-01), Contreras et al.
patent: 5386328 (1995-01-01), Chiou et al.

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