Modulation method and apparatus with adjustable divisors of...

Details Modulation method and apparatus with adjustable divisors of... Modulation method and apparatus with adjustable divisors of...

2007-11-06

2007-11-06

Pascal, Robert (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

C331S025000, C331S034000, C332S100000, C332S128000, C327S156000

Reexamination Certificate

active

11163356

ABSTRACT:
A modulation method and a modulation apparatus in a phase-locked loop (PLL) provided. The modulation apparatus comprises a modulator, a crystal oscillator, a controllable R-divisor frequency divider, a controllable N-divisor frequency divider and a voltage-controlled oscillator (VCO). The crystal oscillator generates a fixed frequency oscillating signal. The controllable R-divisor frequency divider receives the oscillating signal from the crystal oscillator and divides the frequency by R. The VCO generates a frequency signal based on a voltage-controlled signal provided by the PLL and feedbacks the frequency signal to the controllable N-divisor frequency divider. The controller N-divisor frequency divider receives a feedback frequency from the VCO and divides the frequency by N. A PLL unit used to compare a frequency provided by the crystal oscillator and passed through the controllable R-divisor frequency divider, with a frequency provided by the VCO and passed through the controllable N-divisor frequency divider, for performing a phase-locked operation.

REFERENCES:
patent: 3805192 (1974-04-01), Ocnaschek et al.
patent: 5091706 (1992-02-01), Lautzenhiser
patent: 5467373 (1995-11-01), Ketterling

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