Title :
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
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;
Conference_Titel :
Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International
Conference_Location :
Anaheim, CA
Print_ISBN :
978-1-4244-6056-4
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2010.5517303
