VOLTAGE-CONTROLLED OSCILLATOR COMPRISING A CIRCUIT FOR COMPENSATING FREQUENCY PULLING

摘要

The invention concerns a method for stabilizing the operation of a voltage-controlled oscillator (VCO) monitored by a phase locked loop (PLL), the voltage-controlled oscillator delivering a RF signal and receiving via at least one disturbance path a frequency harmonics component equal or close to that of the RF signal, capable of disturbing its operation by injection pulling effect. The invention is characterized in that the method comprises a step which consists in injecting into the voltage-controlled oscillator a signal for compensating the injection pulling effect, whereof the phase and amplitude are adjusted to as to neutralize the effects of the disturbance harmonics component. The invention is applicable in particular to IQ phase modulation in radiotelephony.