A Robust Read Channel System Directly Processing Asynchronous Sampling Data

Adaptive oversampling rate controller in full-digital timing recovery for read channel systems

“…On the other hand, a full-digital timing recovery system, which uses a fixed frequency clock generated by a simple frequency synthesizer and a full-digital timing detector, has been proposed in [3] [4]. Figure 1 (b) shows a block diagram of the read channel described in [4].…”

“…Figure 1 (b) shows a block diagram of the read channel described in [4]. Since the fixed frequency clock generated by the frequency synthesizer is asynchronized with channel clock, the oversampling rate, which means the ratio of the clock frequency generated by the frequency synthesizer to the channel clock frequency, varies according to a data transfer rate.…”

“…[4]. The current system is based on the premise that the clock frequency generated by a frequency synthesizer is higher than the channel clock frequency.…”