| 摘要 |
The invention as disclosed 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 said reference oscillator (10) with a divided frequency of said frequency divider (8), and a charge pumping means (14) connected to said phase detector (12) and is characterised in that said connection (13) between said phase detector (12) and said 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 said voltage controlled oscillator (2). |
