Study of direct-conversion transmitter pulling effects in constant envelope modulation systems

Author

Hsiao, Chieh-Hsun ; Li, Chien-Jung ; Wang, Fu-Kang ; Tzyy-Sheng Horng ; Peng, Kang-Chun

Author_Institution

Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Kaohsiung, Taiwan

fYear

2010

fDate

23-28 May 2010

Firstpage

1174

Lastpage

1177

Abstract

This paper aims to study the local oscillator (LO) pulling effects on a wireless direct-conversion transmitter (DCT) that uses constant envelope modulation. A phase dynamic model for a phase-locked loop (PLL) under directly modulated self-injection is proposed to predict the degraded phase noise performance for a LO pulled by a feedback modulation signal from the power amplifier output. In addition, the model can analyze the deterioration of the transmit signal quality due to such pulling effects. Comparison between the theoretical and experimental results shows excellent agreement.

Keywords

injection locked oscillators; phase locked loops; phase locked oscillators; constant envelope modulation systems; direct-conversion transmitter pulling effects; feedback modulation signal; local oscillator pulling effects; phase locked loop; transmit signal quality; Degradation; Discrete cosine transforms; Local oscillators; Output feedback; Phase locked loops; Phase modulation; Phase noise; Power system modeling; Predictive models; Transmitters; Local oscillator (LO) pulling; direct-conversion transmitter (DCT); injection pulling; phase noise; phase-locked loop (PLL); signal quality;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International

Conference_Location

Anaheim, CA

ISSN

0149-645X

Print_ISBN

978-1-4244-6056-4

Electronic_ISBN

0149-645X

Type

conf

DOI

10.1109/MWSYM.2010.5517303

Filename

5517303