Compensating method for a PLL circuit that functions...

Oscillators – Automatic frequency stabilization using a phase or frequency... – With reference oscillator or source

Reexamination Certificate

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C331S044000, C332S127000, C332S128000

Reexamination Certificate

active

07154347

ABSTRACT:
A PLL circuit is tuned to a first frequency by using a first digital modulation signal and subsequently tuned to a second frequency by using a second digital modulation signal. A differential signal, that is a function of the change in voltage of a VCO control signal generated by the modulation signals, is compared with a comparison signal, that is characteristic of the analog modulation amplitude. Based on the comparison the analog modulation amplitude is changed to minimize or substantially eliminate a deviation between the signals.

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International Search Report for International Application No. PCT/DE02/02709, International Filing Date Jul. 24, 2002, 3 pgs.

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