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TDC circuit for use in CDRs

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ngox

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Hi, I am trying to find examples of TDC used in CDRs for use between the phase detectors and digital loop filter. Thus far I could only find TDC for use in frequency acquisition in PLLs, and nothing really for CDRs. A large number of TDC circuits I found for PLL use the lower-speed reference clock as a sampler, but that option is not really available for a high-speed CDR with random data input.

Any help pointing me in the direction regarding example literature or key words that I may be missing would be most appreciated.
 

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