The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 29, 2005
Filed:
Nov. 09, 2001
Alessandro Venca, San Jose, CA (US);
Baris Posat, Campbell, CA (US);
Kemal Ozanoglu, Palo Alto, CA (US);
Roberto Alini, Dublin, CA (US);
Alessandro Venca, San Jose, CA (US);
Baris Posat, Campbell, CA (US);
Kemal Ozanoglu, Palo Alto, CA (US);
Roberto Alini, Dublin, CA (US);
STMicroelectronics, Inc., Carrollton, TX (US);
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.