Phase-locked loop

Details Phase-locked loop Phase-locked loop

2007-10-09

2007-10-09

Pascal, Robert (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

C331S016000, C331S025000, C331S00100A, C327S156000, C327S157000

Reexamination Certificate

active

11239654

ABSTRACT:
A phase-locked loop includes an oscillator, a phase detector coupled to the oscillator, a charge pump coupled to the phase detector, a filter coupled to the charge pump, a voltage controlled oscillator, and a fractional frequency divider. The voltage controlled oscillator sends a VCO signal to the divider which sends an output signal to the phase detector. The divider comprises a prescaler that divides the VCO signal by an integer number and the divider emits a first signal representing the result of the division. The phase-locked loop comprises an accumulator coupled to the divider and a digital-analog converter that receives the first signal and outputs a DAC signal aligned with the first signal. The phase-locked loop comprises a circuit coupled to the digital-analog converter and to the prescaler to synchronize the DAC signal with a signal output from the prescaler.

REFERENCES:
patent: 3781685 (1973-12-01), Ching
patent: 4316151 (1982-02-01), Ooms
patent: 6249685 (2001-06-01), Sharaf et al.
patent: 6308049 (2001-10-01), Bellaouar et al.
patent: 0 147 307 (1985-07-01), None

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