Automatic gain control for magnetic disk-drive preamplifier
US7835098B2 · kind B2 · utility
0Cited by
8References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 28, 2008 |
| Grant date | Nov 16, 2010 |
| Priority date | — |
| Expiry date | Jun 23, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/09
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
One embodiment of the invention includes a preamplifier system for a magnetic disk-drive. The system comprises a read amplifier configured to generate a read signal corresponding to data that is read from a magnetic disk via a magneto-resistive (MR) read head. The system also comprises a gain control amplifier that is configured to amplify the read signal based on a digital gain value to generate an amplified read signal. The system further comprises a feed-forward automatic gain controller (AGC) configured to set the digital gain value based on an amplitude of the read signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.