Method and apparatus for offset and gain correction

摘要

Aspects of the disclosure provide a signal processing circuit that has fast response time to sudden profile changes in an electrical signal. The signal processing circuit includes a processing path configured to process an electrical signal that is generated in response to reading data on a storage medium, and a feed-forward correction module. The feed-forward correction module is configured to detect a profile variation based the electrical signal in a time window, and correct the electrical signal in the time window based on the detected profile variation.

主权项

1. A react channel, comprising:
a front-end processing circuit that receives an electrical signal and that includes a feedback control loop that corrects errors in the electrical signal; a feed-forward correction circuit that is configured to detect a profile variation of the electrical signal and that includes a feed-forward loop that corrects error in a delayed electrical signal; and a timing compensation circuit that feedbacks the corrected delayed electrical signal to the front-end processing circuit.