Automatically adjusting the dynamic range of the VCO in a PLL at

Details Automatically adjusting the dynamic range of the VCO in a PLL at Automatically adjusting the dynamic range of the VCO in a PLL at

1996-12-26

1999-09-21

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 11, 331 14, 331 16, 331 17, 331 25, 331 57, H03L 707, H03L 7087, H03L 710

Patent

active

059559284

ABSTRACT:
A phase locked loop (PLL) circuit includes a phase comparator that compares the phases of an input signal and a feedback signal and generates UP and DOWN pulses that are related to the phase difference. A charge pump receives the UP and DOWN pulses from the phase comparator and either charges or discharges the tuning voltage of a loop filter. The voltage controlled oscillator (VCO) provides an output signal that has a frequency that is related to the tuning voltage. A frequency divider then divides the frequency of the VCO output by a factor of N and provides the output as the feedback signal to the phase comparator. The PLL includes pre-lock circuitry that responds to an active state of a pre-lock input signal by narrowing the dynamic range of the VCO to a pre-lock range that is centered around a predetermined final frequency and that deactivates upon achieving the pre-lock range.

REFERENCES:
patent: 4511858 (1985-04-01), Charavit et al.
patent: 4562410 (1985-12-01), O'Rourke
patent: 5142249 (1992-08-01), Hirotomi
patent: 5382922 (1995-01-01), Gersbach et al.
patent: 5477194 (1995-12-01), Nagakura

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