Method and apparatus for clock recovery
AssigneeGigamax Technologies, Inc.
InventorsSteven J. Fraasch, Russell E. Cook, Jr., Jan B Wilstrup, Peng Li
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Abstract
A clock recovery system includes a rough clock generator, which yields a rough clock signal, based upon logic level transitions exhibited by a data signal. The rough clock signal is supplied to a phase locked loop having an adjustable order of frequency response, an adjustable corner frequency, an adjustable natural frequency, and/or an adjustable damping factor. The clock recovery system includes control parameters that, when properly adjusted, suppress non-ideal effects of components within the clock recovery system, and also permit the frequency response of the phase locked loop to be returned to a desired response.
Claims6
A method of suppressing non-ideal effects in a clock recovery system exhibited by a rough clock generator of the clock recovery system configured to receive a data signal and to deliver a rough clock signal, the rough clock generator including control parameters affecting operation of the rough clock generator, the method comprising:
- receiving the rough clock signal with the clock recovery system;
- mixing down the rough clock signal in the clock recovery system to a lower frequency, yielding a replicant rough clock signal;
- observing the replicant rough clock signal in the clock recovery system to identify energy in spectral bands not native to the replicant clock signal;
- and
- adjusting at least one control parameter of the clock recovery system to reduce the energy in said spectral bands.
Dependencies are inferred from the claim text.