Title: Compensating method for a pll circuit that functions according to the two-point principle, and pll circuit provided with a compensating device
Application Number: 02818991 Application Date: 2002.07.24
Publication Number: 1559104 Publication Date: 2004.12.29
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03C3/09
Applicant(s) Name: Infineon Technologies AG Address:
Inventor(s) Name: Grewing Christian, Hammes Markus, Hanke Andre
Attorney & Agent: cheng tianzheng liang yong
Abstract:
     A PLL circuit (1) is tuned to a first frequency (F1) by using a first digital modulation signal (6) and is subsequently tuned to a second frequency (F2) by using a second digital modulation signal (6'). A differential signal (9'), which is characteristic of the change in voltage of a control signal (SS) of the VCO (14), said change being effected by the modulation signals, is compared with a comparison signal (8') that is characteristic of the analogous modulation amplitude, and the analogous modulation amplitude is changed in order to eliminate a variation determined during the comparison.
Time: 12