Quotient phase-shift processor for digital phase-locked-loops
First Claim
1. A quotient digital phase locked loop, comprising:
- (a) binary phase detector means which compares an incoming signal to an internally-generated baud clock signal to provide a phase error bit sequence which indicates whether the phase of the incoming signal is early or late with respect to the phase of the baud clock signal; and
(b) a digital controlled clock which integrates the phase error bit sequence to effect nonperiodic phase manipulation of the baud clock signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A quotient phase-shift processor is provided which includes novel techniques for realizing phase corrections of a digital phase-locked-loop. A binary phase-detector of the "early-late" type is combined with range-phase-detector circuitry to generate a variable lock acquisition speed. Phase measure and speed control are performed by incremental manipulation which feeds a novel "quotient" processor. The quotient processor integrates the incremental phase errors and performs phase corrections in a nonperiodic fashion, resulting in lower effective proportional loop gain than that provided in standard phase-locked-loops. Wide capture-range and low jitter are obtained by dynamically varying a loop time constant. Pattern dependent noise is reduced by a novel gating technique. High crystal-frequency requirements are reduced, extending the spectral application of digital phase-locked-loops.
-
Citations
9 Claims
-
1. A quotient digital phase locked loop, comprising:
-
(a) binary phase detector means which compares an incoming signal to an internally-generated baud clock signal to provide a phase error bit sequence which indicates whether the phase of the incoming signal is early or late with respect to the phase of the baud clock signal; and (b) a digital controlled clock which integrates the phase error bit sequence to effect nonperiodic phase manipulation of the baud clock signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification