Phase Dependent Distortion in Direct Conversion Transmitters

Michael Ernst Gadringer; Wolfgang Bösch; Gottfried Magerl

doi:10.1109/TMTT.2011.2170577

Phase Dependent Distortion in Direct Conversion Transmitters

Michael Ernst Gadringer, Wolfgang Bösch, Gottfried Magerl

Institut für Hochfrequenztechnik (4510)

Publikation: Beitrag in einer Fachzeitschrift › Artikel › Begutachtung

Abstract

The impairments and nonlinear (NL) distortion generated by the analog quadrature modulator in a direct conversion transmitter affect the performance of a transmission system. These effects cause input signal dependent gain variations at the low-pass equivalent I/Q-modulator output. The aim of this paper is to analytically derive the relationship between the mean transmitter gain and the tone phases of single- or two-tone excitation signals. This relationship is separately evaluated for the different distortion sources in the direct conversion transmitter. It will be shown that only two-tone signals with frequencies symmetrical to DC are able to excite these phase-dependent gain variations. Additionally, the conditions for the presence of the distortion mechanisms are highlighted. Using measurements of an experimental transmitter setup, the validity of the derived results is shown. The presence of phase-dependent gain changes were also measured when applying a DC-symmetric multi-tone signal

Originalsprache	englisch
Seiten (von - bis)	3219-3227
Fachzeitschrift	IEEE Transactions on Microwave Theory and Techniques
Jahrgang	59
Ausgabenummer	12
DOIs	https://doi.org/10.1109/TMTT.2011.2170577
Publikationsstatus	Veröffentlicht - 2011

Fields of Expertise

Information, Communication & Computing

Treatment code (Nähere Zuordnung)

Basic - Fundamental (Grundlagenforschung)
Experimental

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10.1109/TMTT.2011.2170577

Andere Dateien und Links

Hochfrequenz und mm-Wellen Messtechnik
Amschl, D. (Teilnehmer (Co-Investigator)), Gruber, A. (Teilnehmer (Co-Investigator)), Gadringer, M. E. (Teilnehmer (Co-Investigator)), Auinger, B. (Teilnehmer (Co-Investigator)), Paulitsch, H. (Teilnehmer (Co-Investigator)), Sattler, S. (Teilnehmer (Co-Investigator)), Bösch, W. (Teilnehmer (Co-Investigator)), Schreiber, H. (Teilnehmer (Co-Investigator)) & Freidl, P. F. (Teilnehmer (Co-Investigator))
1/01/10 → 31/12/24
Projekt: Arbeitsgebiet

Dieses zitieren

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AB - The impairments and nonlinear (NL) distortion generated by the analog quadrature modulator in a direct conversion transmitter affect the performance of a transmission system. These effects cause input signal dependent gain variations at the low-pass equivalent I/Q-modulator output. The aim of this paper is to analytically derive the relationship between the mean transmitter gain and the tone phases of single- or two-tone excitation signals. This relationship is separately evaluated for the different distortion sources in the direct conversion transmitter. It will be shown that only two-tone signals with frequencies symmetrical to DC are able to excite these phase-dependent gain variations. Additionally, the conditions for the presence of the distortion mechanisms are highlighted. Using measurements of an experimental transmitter setup, the validity of the derived results is shown. The presence of phase-dependent gain changes were also measured when applying a DC-symmetric multi-tone signal

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Phase Dependent Distortion in Direct Conversion Transmitters

Abstract

Fields of Expertise

Treatment code (Nähere Zuordnung)

Zugriff auf Dokument

Andere Dateien und Links

Fingerprint

Projekte

Hochfrequenz und mm-Wellen Messtechnik

Dieses zitieren