Analysis and Improvement of Direct-Conversion Transmitter Pulling Effects in Constant Envelope Modulation Systems

被引：13

作者：

Hsiao, Chieh-Hsun ^{[1
]}

Li, Chien-Jung ^{[1
]}

Wang, Fu-Kang ^{[1
]}

Horng, Tzyy-Sheng ^{[1
]}

Peng, Kang-Chun ^{[2
]}

机构：

[1] Natl Sun Yat Sen Univ, Dept Elect Engn, Kaohsiung 80424, Taiwan

[2] Natl Kaohsiung First Univ Sci & Technol, Dept Comp & Commun Engn, Kaohsiung 811, Taiwan

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2010年 / 58卷 / 12期

关键词：

Direct-conversion transmitter (DCT); injection pulling; local oscillator (LO) pulling; phase-locked loop (PLL); phase noise; self-injection locking; signal quality; PHASE-NOISE REDUCTION; INJECTION LOCKING; OSCILLATORS; LOOP;

D O I：

10.1109/TMTT.2010.2087351

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Elucidating how local oscillator (LO) pulling affects a wireless direct-conversion transmitter that uses constant envelope modulation is of concern for global system for mobile communication (GSM). Therefore, this paper presents a phase dynamic model for a phase-locked loop (PLL) under directly modulated self-injection to evaluate the degraded phase noise performance of an LO pulled by a feedback modulation signal from the power amplifier output. Additionally, based on theoretical analysis, the proposed model can instruct system designers on how to optimize PLL parameters, as well as introduce an inner self-injection to minimize the impact of pulling effects. The improved performance is verified by implementing a Gaussian minimum-shift keying transmitter for GSM applications. Furthermore, the theoretical and experimental results correlate well with each other.

引用

页码：4137 / 4146

页数：10

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