Dual loop clock recovery circuit

Pulse or digital communications – Systems using alternating or pulsating current – Angle modulation

Reexamination Certificate

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C375S372000, C708S003000

Reexamination Certificate

active

08036300

ABSTRACT:
A clock recovery circuit for digital data transmission includes a delay lock loop having a first loop which generates a phase difference signal which is indicative of a quantized phase difference between a data signal and a clock signal; and a second loop which generates a phase difference signal which is a smooth, continuous function of the phase difference between the data signal and the clock signal, such as a phase difference signal which is proportional to the phase difference. The delay lock loop may include two phase shifters in series, and one or both of these may include a phase interpolator.

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