Reproducing circuit for magneto-resistive head having an initial

Details Reproducing circuit for magneto-resistive head having an initial Reproducing circuit for magneto-resistive head having an initial

1994-06-23

1996-08-20

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

330 9, 330259, G11B 502, H03F 102, H03F 345

Patent

active

055484530

ABSTRACT:
A recording/reproducing apparatus for a magneto-resistive (MR) head having a playback amplifier, including a capacitor for a dc feedback low-pass filter for dc feedback to an initial-stage transistor, and a differential amplifier (gm amplifier), and a switching device for the gm amplifier and for the initial-stage amplifier operable at the time of recording/playback switching. The timing of the switching device is deviated for shortening the switching time interval. To this end, an output of the initial-stage transistor of a playback amplifier for a MR head is compared to reference voltage Vref by a gm amplifier and the low-pass filter is constituted by transconductance gm of the gm amplifier and the capacitance of the capacitor, with the dc output of the gm amplifier being fed back to the base of the initial-stage amplifier. The delay in switching time by the charging of the capacitor caused by the difference in the rise time of the initial-stage transistor and the gm amplifier is deviated by the control signal from a control circuit to control the initial-stage transistor and the gm amplifier.

REFERENCES:
patent: 5027003 (1991-06-01), Haight et al
patent: 5270883 (1993-12-01), Umeyama
patent: 5323278 (1994-06-01), Contreras et al.
IBM Technical Disclosure Bulletin, vol. 33, No. 4 Sep. 1990.

Affiliated with

Also associated with

Rating

Reproducing circuit for magneto-resistive head having an initial does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Reproducing circuit for magneto-resistive head having an initial, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reproducing circuit for magneto-resistive head having an initial will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2334787