| US 7,539,091 B2 | ||
| Differential push-pull gain controlling method and apparatus to reduce the effects of rotational eccentricity | ||
| Louis J. Serrano, Los Gatos, Calif. (US); and Ting Zhou, Alameda, Calif. (US) | ||
| Assigned to LSI Corporation, Milpitas, Calif. (US) | ||
| Filed on Nov. 18, 2005, as Appl. No. 11/282,881. | ||
| Prior Publication US 2007/0115792 A1, May 24, 2007 | ||
| Int. Cl. G11B 7/095 (2006.01) | ||
| U.S. Cl. 369—44.35 [369/44.29; 369/53.14] | 20 Claims |
| 1. An apparatus comprising:
a photo diode array configured to generate a plurality-of beam signals;
a differential push-pull generator circuit configured to generate a differential push-pull signal with one or more gain blocks
in response to (i) a radius adjustment signal, (ii) a gain approximation signal, and (iii) said plurality of beam signals;
and
an attenuation prediction circuit configured to (i) predict an attenuation factor of said differential push-pull signal and
(ii) generate said gain approximation signal in response to (a) a plurality of amplification signals and (b) a plurality of
angle signals, wherein said gain approximation signal is generated to compensate for the predicted attenuation factor of said
differential push-pull signal.
|