| 摘要 |
The invention relates to a phase-locked loop circuit ( 1 ) in a radio transceiver for the detection of the linear operation of a first voltage controlled oscillator ( 2 ), which comprises a frequency divider ( 8 ), a reference oscillator ( 10 ), a phase detector ( 12 ) to compare the phases of the reference oscillator ( 10 ) with a divided frequency of the frequency divider ( 8 ), and a charge pumping means ( 14 ) connected to the phase detector ( 12 ) and is characterised in that the connection ( 13 ) between the phase detector ( 12 ) and the charge pumping means ( 14 ) has at least one branch-off line ( 15 ) connected to at least one filtering means ( 22 ), whose output voltage is related to the linear operation of the voltage controlled oscillator ( 2 ).
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