Implementing spin-torque oscillator sensing with enhanced delay control feedback circuit for hard disk drives
US8553346B2 · kind B2 · utility
36Cited by
3References
20Claims
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Key dates
| Filing date | Dec 9, 2011 |
| Grant date | Oct 8, 2013 |
| Priority date | — |
| Expiry date | Mar 21, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0016
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method, apparatus, and system for implementing spin-torque oscillator (STO) sensing with an enhanced delay control feedback circuit for hard disk drives. A detector receives an input signal from a STO read sensor having an oscillation frequency related to the strength of the detected magnetic signal field. The received input signal is mixed with a time delayed input signal for providing a detector output signal. A low frequency component signal of the detector output signal is monitored and a delay control feedback is applied to an adjustable time delay to bias the DC signal of the detector output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.