Clock recovery circuit for extracting clock information from a r

Details Clock recovery circuit for extracting clock information from a r Clock recovery circuit for extracting clock information from a r

1993-11-24

1995-01-24

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 14, 375120, H03L 700

Patent

active

053845528

ABSTRACT:
In a clock recovery circuit, an asynchronous oscillator generates a first clock pulse at a frequency n times the frequency of a baseband signal. A sampler samples the baseband signal in response to the first clock pulses. A flip-flop holds and delivers the sampled signal in response to a second clock pulse supplied from a voltage-controlled oscillator. The time difference between the first clock pulse and the second clock pulse is detected and a set of tap-gain values is selected according to the time difference. The sample delivered from the flip-flop is successively delayed by a tapped delay line to produce tap signals which are respectively weighted with the selected tap-gain values. The weighted samples are summed to estimate an intermediate sample. A clock phase error of the estimated sample with respect to the clock timing of the transmitted signal is determined for controlling the VCO.

REFERENCES:
patent: 4595992 (1986-06-01), Drogin

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