Apparatus for providing a system clock locked to an external clo

Details Apparatus for providing a system clock locked to an external clo Apparatus for providing a system clock locked to an external clo

1991-12-23

1994-03-15

Kuntz, Curtis

Pulse or digital communications

Spread spectrum

Direct sequence

328155, 307262, H03D 324

Patent

active

052951642

ABSTRACT:
A digital phase lock loop circuit for synchronizing the phase of clock signals delivered to devices through clock tree circuitry with the phase of input clock signals including a first delay line, a second delay line, a phase detector circuit, apparatus for transferring the input clock signals through the first delay line to the phase detector circuit, apparatus for transferring the input clock signals through the second delay line and the clock tree circuitry to the phase detector circuit, apparatus responsive to the difference in phase detected between the clock signals transferred through the first and second delay lines for varying the delay of one of the delay lines to bring the clock signals transferred through the first and second delay lines into phase with one another.

REFERENCES:
patent: 4789996 (1988-12-01), Butcher
patent: 5079519 (1992-01-01), Ashby et al.

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