Wide range clock recovery circuit

Details Wide range clock recovery circuit Wide range clock recovery circuit

1983-08-18

1986-05-20

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

375 82, 331 1A, H03D 324

Patent

active

045906025

ABSTRACT:
A wide range, variable rate clock recovery circuit for NRZ data is provided having a PLL and a frequency synthesizer which share control of a common VCO in single loop realization. Narrow PLL bandwidths and short acquisition time may be achieved employing the frequency synthesizer to initially control the VCO to produce an estimate of the data frequency which is accurate to within the bandwidth of the PLL. Once this VCO frequency is attained, the PLL disables the frequency synthesizer control of the VCO and provides fine tuning control of the VCO output frequency itself. Single loop realization is achieved with a wide range VCO which includes a narrow range VCO, a frequency divider, and an auto-ranging circuit.

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