Clock and data recovery circuit using an injection locked oscillator
AssigneeMediatek Inc.
InventorsShiue-Shin Liu, Chih-Chien Hung, Shao-Hung Lin
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Abstract
A clock and data recovery circuit includes a sampler, a skew compensation block, a pulse generator, and an injection locked oscillator. The injection locked oscillator generates a recovered clock signal, the pulse generator generates a pulse signal according to input data for controlling the injection locked oscillator, the skew compensation block compensates the input data and generate compensated data, and the sampler samples the compensated data according to the recovered clock signal.
Claims13
A clock and data recovery circuit, comprising:
- an injection locked oscillator configured to generate a recovered clock signal, the injection locked oscillator comprising:
- a two stage ring oscillator;
- and
- an injection switch coupled to the two stage ring oscillator;
- a pulse generator coupled to the injection locked oscillator and configured to generate a pulse signal according to input data for controlling the injection locked oscillator;
- a sampler coupled to the input data and the injection locked oscillator and configured to sample the input data according to the recovered clock signal;
- and
- a skew compensation block coupled to the input data and configured to compensate the input data and generate compensated data to be sampled by the sampler.
A method of operation of a clock and data recovery circuit, the clock and data recovery circuit comprising:
- an injection locked oscillator configured to generate a recovered clock signal, the injection locked oscillator comprising:
- a two stage ring oscillator;
- and
- an injection switch coupled to the two stage ring oscillator;
- a pulse generator coupled to the injection locked oscillator and configured to generate a pulse signal according to input data for controlling the injection locked oscillator;
- and
- a sampler coupled to the input data and the injection locked oscillator and configured to sample the input data according to the recovered clock signal;
- and
- a skew compensation block coupled to the input data and configured to compensate the input data and generate compensated data to be sampled by the sampler;
- the method comprising:
- the injection locked oscillator generating the recovered clock signal;
- the pulse generator generating the pulse signal according to the input data for controlling the injection locked oscillator;
- and
- the sampler sampling the input data according to the recovered clock signal.
Dependencies are inferred from the claim text.