Method to vary symmetry and coupling in symmetrical write...

Details Method to vary symmetry and coupling in symmetrical write... Method to vary symmetry and coupling in symmetrical write...

2004-09-01

2008-11-11

Wellington, Andrea (Department: 2627)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

Reexamination Certificate

active

07450329

ABSTRACT:
The present invention achieves technical advantages as a preamplifier write driver (10) having a varying common-mode output voltage. This varying common-mode output voltage also adjusts the derivative of the common-mode voltage, which is proportional to the amount of current coupled onto the MR head through parasitic capacitance. Currents of a first circuit (Q0,Q3) and a second circuit (Q1,Q2) are matched to overcome process variations and modeling errors. A pair of transresistance amplifiers (16) are driven by control lines (14) to achieve these matched currents.

REFERENCES:
patent: 6246533 (2001-06-01), Davis et al.
patent: 7006313 (2006-02-01), Ngo
patent: 7068454 (2006-06-01), Kuehlwein et al.
patent: 2002/0176198 (2002-11-01), Cyrusian et al.
patent: 2004/0196581 (2004-10-01), VanEaton et al.
patent: 2004/0196582 (2004-10-01), VanEaton et al.
patent: 2005/0007686 (2005-01-01), Bloodworth et al.
patent: 2005/0152206 (2005-07-01), Barnett et al.
patent: 2006/0012902 (2006-01-01), Sharifi

Affiliated with

Also associated with

Rating

Method to vary symmetry and coupling in symmetrical write... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method to vary symmetry and coupling in symmetrical write..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method to vary symmetry and coupling in symmetrical write... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4023694