Phase locked loop circuit

Details Phase locked loop circuit Phase locked loop circuit

1998-11-30

2000-10-17

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327157, 327159, 327160, 327161, H03L 706

Patent

active

061337706

ABSTRACT:
A phase locked loop circuit comprises a voltage controlled oscillator generating an output signal having the frequency controlled by an applied control voltage, a comparing circuit for comparing an input signal with the output signal of the voltage controlled oscillator in phase or in frequency, and a charge pump and loop filter receiving an output signal of the comparing circuit for generating the control voltage applied to the voltage controlled oscillator. A control circuit is additionally provided which receives the output signal of the comparing circuit for controlling, on the basis of a pulse width of the output signal of the comparing circuit, a center frequency of a phase locked loop formed of the voltage controlled oscillator, the comparing circuit and the control voltage outputting circuit. Thus, the PLL circuit constructed of only a simple digital circuit and having an enlarged capture range and a high stability, can be realized.

REFERENCES:
patent: 4933959 (1990-06-01), Knechtel
patent: 5382922 (1995-01-01), Gersbach et al.
patent: 5648744 (1997-07-01), Prakash et al.
patent: 5696468 (1997-12-01), Nise

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