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公开(公告)号：DE602004011937D1
公开(公告)日：2008-04-03
申请号：DE602004011937
申请日：2004-09-15
Applicant: ST MICROELECTRONICS SRL
Inventor： FILOCAMO BASILIO , GRAMEGNA GIUSEPPE
Abstract: A method for calibrating the frequency of an oscillator in a phase-locked loop (PLL) is disclosed. For calibration, the loop is opened upstream the VCO and a fixed control voltage is applied, while the frequency of the VCO is altered in response to a digital control word supplied for band selection. The VCO is (1.) steered to a highest frequency, (2.) to a lowest frequency and (3.) repeatedly to an intermediate frequency dependent upon the previously measured frequencies and the desired target frequency. The resolution of the frequency measurement is increased from step to step.
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