Patent · US Expired

Compensating method for a PLL circuit that functions according to the two-point principle, and PLL circuit provided with a compensating device

US7154347B2 · kind B2 · utility

6Cited by

8References

17Claims

0Family size

Assignee

Infineon Technologies AG · DE

Inventors

Christian Grewing · Düsseldorf, DE
Markus Hammes · Dinslaken, DE
Andre Hanke · Mülheim an der Ruhr, DE
Giuseppe Li Puma · Bochum, DE

Key dates

Filing date	Jul 24, 2002
Grant date	Dec 26, 2006
Priority date	—
Expiry date	Sep 16, 2022

Classification

Technology area (CPC H)Electricity
CPC primaryH03L7/1976
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A PLL circuit is tuned to a first frequency by using a first digital modulation signal and subsequently tuned to a second frequency by using a second digital modulation signal. A differential signal, that is a function of the change in voltage of a VCO control signal generated by the modulation signals, is compared with a comparison signal, that is characteristic of the analog modulation amplitude. Based on the comparison the analog modulation amplitude is changed to minimize or substantially eliminate a deviation between the signals.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.