| Title: | Method for trimming a two-point modulator, and a two-point modulator having a trimming apparatus | ||
| Application Number: | 03804340 | Application Date: | 2003.02.07 |
| Publication Number: | 1636312 | Publication Date: | 2005.07.06 |
| Approval Pub. Date: | Granted Pub. Date: | ||
| International Classifi-cation: | H03C3/09 | ||
| Applicant(s) Name: | Infineon Technologies AG | Address: | |
| Inventor(s) Name: | Hammes Markus;Puma Giuseppe L.;Waasen Stefan V. | ||
| Attorney & Agent: | cheng tianzheng zhang zhicheng | ||
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Abstract: |
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| Disclosed is a PLL circuit (1) which is tuned to a first frequency by means of a digital modulation signal (28) and then to a second frequency by deactivating the digital modulation signal (28). A difference signal (32) that is characteristic of the voltage modification of a VCO (7) control signal (22), which is generated by deactivating the digital modulation signal (28), is compared with an analogous modulation signal (34). The analogous modulation signal (34) is modified in such a way that a deviation which has been detected during the comparison is eliminated. | |||
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| Time: | 13 | ||
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