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:
Sep. 04, 2012
Filed:
Jun. 28, 2011
Yuan Zheng, Fremont, CA (US);
Alex Chiang, Taipei, TW;
Enya Cheng, San Jose, CA (US);
Marvell International Ltd., Hamilton, BM;
Abstract
A gain calibration method for optical storage servo systems in which, plant gain calibration is used by injecting a reference sine wave r into an optical storage servo system, obtaining an effort signal m at the input of the servo plant and an error signal y at the output of the servo plant, using a DFT (Discrete Fourier Transformation) to translate the time domain signals m and y into frequency responses M and Y, calculating a Y-to-M ratio, and using the magnitude of the Y-to-M ratio as the plant gain K of the servo system. The servo system's sensor gain Kat the outermost layer of a disk may be calibrated by, e.g., the conventional peak-to-peak measurement. Since K=K·K, the servo system's actuator gain Kat the outermost layer of the disk may be obtained. Because the actuator gain Kis the same for all layers of a disk, the variation of the sensor gain Kat an inner layer may follow that of the plant gain K at that layer. Accordingly, the sensor gain Kmay be calibrated for each layer of a multilayer disk, and the calibration is independent from the compensator C.