Phase-locked loop circuit with charge pump and time constant cir

Details Phase-locked loop circuit with charge pump and time constant cir Phase-locked loop circuit with charge pump and time constant cir

1997-02-27

1999-06-15

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327156, 327158, 331 8, 331 17, 331 25, H03L 706

Patent

active

059125756

ABSTRACT:
A phase-locked loop (PLL) circuit includes a low-pass filter, a voltage controlled oscillator that produces a PLL signal having a frequency that differs according to a control voltage supplied by the low-pass filter, a phase detector which receives the PLL signal and a reference signal and detects a phase difference between them to produce an error signal, and a charge pump that, in response to the error signal, supplies a charge to the low-pass filter or extracts a charge from the low-pass filter. The charge pump includes a variable resistance element the resistance of which varies when the error signal is applied, thereby nonlinearly adjusting the charge supplied to or extracted from the low-pass filter with respect to the duration of the error signal from the phase detector.

REFERENCES:
patent: 4698531 (1987-10-01), Jones
patent: 5473283 (1995-12-01), Luich

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