| 摘要 |
An analogue to digital converter system includes an analogue to digital converter 14 for sampling the symbols at predetermined sample timings and a feedback loop for adjusting the sample timings. The feedback loop includes an eye opening detector 16 which includes a deviation detector for determining a deviation of a digitized symbol sample value with respect to a mean sample value. Preferably, a variance measurement calculator calculates the variance of these deviations. A feedback control is responsive to successive eye opening signals to generate timing control signals for adjusting the sample timings. The deviation detector can employ a fixed means sample value or can determine the mean sample value from a plurality of digitized sample values over a predetermined period. |
