Patent · US Expired

Trimming method and trimming device for a PLL circuit for two-point modulation

US6933798B2 · kind B2 · utility

22Cited by

10References

9Claims

0Family size

Assignee

Infineon Technologies AG · DE

Inventors

Markus Hammes · Dinslaken, DE
Stefan Van Waasen · Kolbermoor, DE

Key dates

Filing date	Aug 22, 2003
Grant date	Aug 23, 2005
Priority date	—
Expiry date	Aug 22, 2023

Classification

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

Abstract

In the case of a trimming method for a PLL circuit operating based on the principle of a two-point modulation, the PLL circuit is locked without any modulation being impressed and then an analog and a digital modulation signal are impressed into the locked PLL circuit. A signal that is characteristic of the PLL control error is tapped from the PLL circuit, and the modulation swing in the analog modulation signal is changed such that the characteristic signal has the same value as before the analog and digital modulation signals were impressed.

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