Patent · US Expired

Polar loop transmission circuit

US6853836B2 · kind B2 · utility

15Cited by

19References

11Claims

0Family size

Assignee

Infineon Technologies AG · DE

Inventors

Michael Asam · Aichach, DE
Stefan Herzinger · Sauerlach, DE
Gunther Kraut · Egmating, DE
Martin Simon · Otterfing, DE
Xiaopin Zhang · Munich, DE

Key dates

Filing date	Nov 15, 2001
Grant date	Feb 8, 2005
Priority date	—
Expiry date	Jul 25, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH03C5/00
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A polar loop transmission circuit is proposed wherein a signal to be transmitted and a feedback signal are separated into their polar phase and amplitude components and the components are compared to one another for realizing a phase and amplitude modulation. An amplitude modulator controlled by an amplitude modulation signal is provided, whereby the amplitude modulator follows an oscillator and is preferably fashioned as a nonlinear amplifier that is operated in saturation. An amplifier attenuating the output signal of the amplitude modulator is provided in the feedback path. The present transmission architecture is suitable for future mobile radio telephone systems having a phase and amplitude modulation and are based on the known GSM standard, for example.

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