Patent · US Expired

Modulator circuit configuration

US6369666B1 · kind B1 · utility

11Cited by

2References

9Claims

0Family size

Assignee

Infineon Technologies AG · DE

Inventors

Martin Simon · Otterfing, DE
Werner Veit · Unterhaching, DE

Key dates

Filing date	Nov 22, 2000
Grant date	Apr 9, 2002
Priority date	—
Expiry date	Nov 22, 2020

Classification

Technology area (CPC H)Electricity
CPC primaryH03C3/40
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

The circuit for combined operation of a mobile radio with GMSK and 8-PSK modulation includes a transmission PLL for GMSK operation, and a direct modulator for 8-PSK operation. A transmission oscillator in the transmission PLL is also used as a synthesizer oscillator for the direct modulator. The modulation in the transmission PLL is suppressed for this purpose. The circuit allows cost-effective implementation while retaining the advantages of a transmission PLL.

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