Timing recovery circuit for manchester coded data

Details Timing recovery circuit for manchester coded data Timing recovery circuit for manchester coded data

Category

H - Electricity

Subcategory

04

Subsubcategory

L

CPC

354/104

IPC codes

H04L 7/02 (2006.01) H04L 7/04 (2006.01) H04L 7/10 (2006.01) H04L 25/49 (2006.01) H04L 7/033 (2006.01)

Type

Patent

Patent number

CA 1242029

Description

ABSTRACT A timing recovery circuit includes a detector for detecting the varying points of a split-phase signal having a repeating logical "1" and "0" pattern at its beginning. A voltage-controlled oscillator (VCO) generates a signal whose frequency is twice as high as that of the timing signal of the split-phase signal and controls the frequency of the generated signal in res- ponse to a control signal. A frequency divider divides by two the output frequency of the VCO. A selector selectively supplies the output of the VCO and that of the frequency divider. A phase detector phase-compares the output of the varying point detector and that of the selector, and supplies the VCO with a signal indicating the relative delay or advance between the two outputs as the control signal. A control circuit controls the selector so that it selects the output of the frequency divider during the repetitive pattern of logical "1" and "0" and that of the VCO elsewhere. The invention permits large scale integration and permits the frame length of data to be large without requiring a highly stable oscillator.

Application Number

492859

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