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:
Jun. 08, 2021
Filed:
Aug. 19, 2020
Headway Technologies, Inc., Milpitas, CA (US);
Yuhui Tang, Milpitas, CA (US);
Ying Liu, San Jose, CA (US);
Headway Technologies, Inc., Milpitas, CA (US);
Abstract
A preamplifier that that is configured for optimizing the write current waveform to achieve the best areal density capability (ADC) and adjacent track interference (ATI) performance of a magnetic recording disk drive. The preamplifier is configured for providing a magnetic head write current with a main pole relaxation zone for providing a buffer zone for main pole relaxation from saturation state to a remanence state before writing the next bit. The preamplifier is further configured for providing a magnetic head write current with a reference main pole relaxation current located at an end region data of each bit. The length of the reference main pole relaxation current is a function of the bit length, frequency, recording velocity, and writer/media switching speed.