Read/write preamplifier with head isolation

Details Read/write preamplifier with head isolation Read/write preamplifier with head isolation

1990-06-28

1992-07-21

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 68, G22B 509, G22B 502

Patent

active

051328526

ABSTRACT:
A read/write preamplifier configured for interconnection with a magnetic head through head contacts. The preamplifier includes a write control switching circuit electrically connected between first and second supply terminals and connected to the head contacts, for controlling current flow through the magnetic head. The switching circuit includes at least one transistor. A first PNP-type transistor is connected between the first supply terminal and the at least one transistor of the write control switching circuit, for controlling current flow to the write control switching circuit so as to cause the switching circuit to be driven between selected and unselected states. A PNP-type transistor bias circuit includes a mode-controlled current sink coupled between the first and second supply terminals and to the first PNP-type transistor. The bias circuit causes the first PNP-type transistor to conduct current and drive the switching circuit to the selected state when the mode-controlled current sink is active, and causes the first PNP-type transistor to prohibit current flow and drive the switching circuit to the unselected state when the mode-controlled current sink is inactive.

REFERENCES:
patent: 4249219 (1981-02-01), Choi et al.
patent: 4357637 (1982-11-01), Gilbert
patent: 4639794 (1987-01-01), Ferrier
patent: 4688112 (1987-08-01), Shoji et al.
patent: 4737867 (1988-04-01), Ishikawa et al.
patent: 4816934 (1989-03-01), Tsuyuguchi

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