Optical servo control circuits and methods using pulse width modulation and offset control for driving an electromechanical motor
US6552979B1 · kind B1 · utility
10Cited by
7References
7Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 30, 2000 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Oct 30, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/52
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Servo control circuitry 300 includes a digital to analog converter 402 for converting digital servo control data into a pulse width modulated signal. A first conductor transmits the pulse width modulated signal to an external device 409. A second conductor transmits a reference signal derived from the clock signal to external device 409, external device 409 differentially receiving the pulse width modulated signal with respect to the reference signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.