Direct Carrier Six-Port Modulator Using a Technique to Suppress Carrier Leakage

Author

Östh, Joakim ; Owais ; Karlsson, Magnus ; Serban, Adriana ; Gong, Shaofang ; Karlsson, Peter

Author_Institution

Commun. Electron. Res. Group, Linkoping Univ., Norrköping, Sweden

Volume

59

Issue

3

fYear

2011

fDate

3/1/2011 12:00:00 AM

Firstpage

741

Lastpage

747

Abstract

This paper presents a direct carrier six-port modulator. To allow arbitrary load impedances to be used and for suppression of carrier leakage, a new circuit architecture with a technique to suppress carrier leakage is proposed and implemented. A theoretical model of the proposed modulator is derived. A prototype modulator utilizing diodes for impedance generation is designed and fabricated for a center frequency of 7.5 GHz for verification of the proposed technique. Measurements show good modulation properties when a 16 quadrature amplitude modulation signal at 100 Msymbol/s is generated, as well as good carrier leakage suppression.

Keywords

leakage currents; modulators; network synthesis; carrier leakage suppression; circuit architecture; diodes; direct carrier six-port modulator; frequency 7.5 GHz; impedance generation; quadrature amplitude modulation signal; Baseband; Correlators; Impedance; Load modeling; Modulation; Schottky diodes; Voltage control; Carrier leakage suppression; direct carrier modulator; six-port correlator;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2011.2104972

Filename

5710018