Patent ID: 7061288

Claim:
A phase-locked loop circuit providing an output signal connectible to circuitry external of the phase-locked loop circuit, the output signal indicative of an operation within a linear operation range, comprising: a first voltage controlled oscillator, a frequency divider, a reference oscillator, a phase detector to compare the phases of said reference oscillator with a divided frequency of said frequency divider, and a charge pumping means connected to said phase detector, characterised in that said connection between said phase detector and said charge pumping means has at least one branch-off line connected to at least one filtering means, the filtering means providing said output signal indicative of operation within a linear operation range of said first voltage controlled oscillator, the phase-locked circuit further comprising a second voltage controlled oscillator which provides a frequency range overlapping with the frequency range of said first voltage controlled oscillator, and a selective switching means for looping in one of the voltage controlled oscillators into the phase locked loop circuit.