Reproducing amplifier and magnetic recording and reproducing...

Details Reproducing amplifier and magnetic recording and reproducing... Reproducing amplifier and magnetic recording and reproducing...

2005-07-19

2005-07-19

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

C360S066000, C360S067000

Reexamination Certificate

active

06920002

ABSTRACT:
In order to solve a problem that it takes a long time to shift from a write mode to a read mode when there is a cross talk of an output signal of a recording head to a reproducing amplifier side, there is provided a reproducing amplifier including an amplifier circuit portion having a differential pair of transistors is provided with a switching circuit comprised of switches connected with resistors, which supply a bias voltage to each base of the differential pair of transistors, respectively in parallel. The switching circuit turns on for a write mode period and for a fixed period after a change from the write mode to a read mode to decrease the input impedance of the reproducing amplifier for the periods.

REFERENCES:
patent: 5345346 (1994-09-01), Brannon et al.
patent: 5357379 (1994-10-01), Gower
patent: 6621649 (2003-09-01), Jiang et al.
patent: 6721117 (2004-04-01), Briskin

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