Patent ID: 9008253
Filing Date: 2015-04-14
Classification: H03L,H04L

Abstract:
1. A control method utilized in a clock data recovery device supporting a plurality of frequency bands, for controlling the clock data recovery device to select an operating frequency band from the plurality of frequency bands and for generating a recovery clock for generating retimed data, the control method comprising: receiving a serial data stream with a data frequency; making each frequency band of the plurality of frequency bands correspond to a plurality of frequency band groups, wherein each frequency band group comprises at least one frequency band and corresponds to different frequency ranges; selecting a frequency band group from the plurality of frequency band groups as a coarse-tuned frequency band group according to the data frequency and a locking voltage range; and selecting a frequency band from the plurality of frequency bands as the operating frequency band according to the data frequency, the locking voltage range and the coarse-tuned frequency band group, for generating the recovery clock; wherein the step of selecting the frequency band group from the plurality of frequency band groups as the coarse-tuned frequency band group according to the data frequency and the locking voltage range comprises: