PLL synthesizer having a voltage controlled oscillator with tuni

Details PLL synthesizer having a voltage controlled oscillator with tuni PLL synthesizer having a voltage controlled oscillator with tuni

1998-09-29

2000-10-31

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327105, 331 16, 331 17, H03L 706

Patent

active

061408514

ABSTRACT:
A PLL (Phase-Locked Loop) synthesizer includes a VCO (Voltage Controlled Oscillator) having an oscillating section and an outputting section. The oscillating section selectively oscillates with a frequency of f2 or f3 in accordance with a control voltage applied to its turning offset control terminal. The outputting section tunes to the frequency f2 or a frequency of 2.times.f3 in accordance with a control voltage applied to its tuning control terminal, and produces an output signal. A variable frequency divider divides a part of the output signal fed thereto with a preselected ratio and delivers its output to a phase comparator. The phase comparator produces a phase error signal representative of a phase difference between the output of the phase comparator and a reference signal. An LPF (Low Pass Filter) filters out high frequency components contained in the phase error signal and delivers its output to a PLL control voltage terminal included in the oscillating section. The oscillating section varies its oscillation frequency in accordance with the output of the LPF such that the phase error signal converges to zero.

REFERENCES:
patent: 5140286 (1992-08-01), Black et al.
patent: 5559474 (1996-09-01), Matsumoto et al.
patent: 5574407 (1996-11-01), Sauer et al.

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