Digital phase-locked loop architecture
First Claim
1. A phase-locked loop circuit comprising:
- an oscillator configured to generate an output signal;
an input for receiving a reference clock signal;
a delay cell configured to delay the reference clock signal to generate a delayed reference clock signal;
a phase comparator configured to generate a quantised signal indicative of the phase difference between the output signal and the reference clock signal;
an integrator configured to integrate the quantised signal to form an integrated signal;
a first feedback path configured to control the phase and/or frequency of the oscillator in dependence on the integrated signal; and
a second feedback path configured to adjust the delay applied by the delay cell in dependence on the integrated signal.
2 Assignments
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Accused Products
Abstract
A phase-locked loop circuit comprising: an oscillator (20) configured to generate an output signal; an input (25) for receiving a reference clock signal; a delay cell (26) configured to delay the reference clock signal to generate a delayed reference clock signal; a phase comparator (27) configured to generate a quantized signal indicative of the phase difference between the output signal and the delayed reference clock signal, an integrator (28) configured to integrate the quantized signal to form an integrated signal; a first feedback path (22) configured to control the phase and/or frequency of the oscillator in dependence on the integrated signal; and a second feedback path (23) configured to adjust the delay applied by the delay cell (26) in dependence on the integrated signal.
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Citations
21 Claims
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1. A phase-locked loop circuit comprising:
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an oscillator configured to generate an output signal; an input for receiving a reference clock signal; a delay cell configured to delay the reference clock signal to generate a delayed reference clock signal; a phase comparator configured to generate a quantised signal indicative of the phase difference between the output signal and the reference clock signal; an integrator configured to integrate the quantised signal to form an integrated signal; a first feedback path configured to control the phase and/or frequency of the oscillator in dependence on the integrated signal; and a second feedback path configured to adjust the delay applied by the delay cell in dependence on the integrated signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification