Dynamic magnetic information storage or retrieval – General recording or reproducing – Signal switching
Reexamination Certificate
2005-11-29
2005-11-29
Tran, Sinh (Department: 2651)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Signal switching
Reexamination Certificate
active
06970316
ABSTRACT:
A circuit and method are disclosed for relatively rapidly causing the current flowing through a write head to transition between steady states without generating an appreciable amount of capacitively-coupled noise. Embodiments of the present invention generally provide drive voltage signals to the write head that have no common mode voltage levels during transitions between steady state current levels in the write head. In other words, the drive voltage signals applied to the write head are substantially entirely differential during write head current transitions. In an exemplary embodiment of the present invention, a driver circuit includes switching circuitry connected between the terminals of the write head and reference voltage supplies, such as positive and negative voltage supplies. The driver circuit further includes timing circuitry that generates control signals for controlling the switching circuitry.
REFERENCES:
patent: 4551772 (1985-11-01), Sliger
patent: 4937802 (1990-06-01), Omori et al.
patent: 5041773 (1991-08-01), Takahashi
patent: 5434717 (1995-07-01), Yoshinaga et al.
patent: 5892371 (1999-04-01), Maley
patent: 6052017 (2000-04-01), Pidutti et al.
patent: 6054888 (2000-04-01), Maley
patent: 6121800 (2000-09-01), Leighton et al.
patent: 6201421 (2001-03-01), Takeuchi et al.
patent: 6236246 (2001-05-01), Leighton et al.
patent: 6252450 (2001-06-01), Patti et al.
patent: 6400190 (2002-06-01), Lacombe
patent: 6504666 (2003-01-01), Patti et al.
“Microelectronic Circuits” by Sedra/Smith, 4th Edition, 1998, Chapter 6, Section 6.2, Titled: “Common Mode Gain” on pp. 499-501.
U.S. Appl. No. 09/651,561, filed Aug. 30, 2000, Alini.
U.S. Appl. No. 09/651,830, filed Aug. 30, 2000, Alini et al.
U.S. Appl. No. 09/839,511, filed Apr. 20, 2001, Patti et al.
Alini Roberto
Ozanoglu Kemal
Posat Baris
Venca Alessandro
Jorgenson Lisa K.
Rodriguez Glenda P.
STMicroelectronics Inc.
Szuwalski Andre
Tran Sinh
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