Wide range clock recovery circuit

Details Wide range clock recovery circuit Wide range clock recovery circuit

Category

H - Electricity

Subcategory

04

Subsubcategory

L

CPC

340/205

IPC codes

H04L 7/00 (2006.01) H03L 7/099 (2006.01) H03L 7/113 (2006.01) H04L 7/033 (2006.01)

Type

Patent

Patent number

CA 1222299

Description

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 fre- quency 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.

Application Number

457871

Affiliated with

Also associated with

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