A varactor configuration minimizing the amplitude-to-phase noise conversion in VCOs

被引：36
|
作者：
Bonfanti, A [1 ]
Levantino, S
Samori, C
Lacaita, AL
机构：
[1] Politecn Milan, Dipartimento Elettron & Informaz, I-20133 Milan, Italy
[2] IFN, CNR Sez Milano, I-20133 Milan, Italy
来源：
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS | 2006年 / 53卷 / 03期
关键词：
diode varactor; flicker noise up-conversion; phase noise; voltage controlled oscillator;
D O I：
10.1109/TCSI.2005.858764
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：
Amplitude-to-phase-noise conversion due to varactors can severely limit the close-in phase noise performance in LC-tuned oscillators. This work proposes a rigorous analysis of this phenomenon, which highlights the fundamental limitations of single-ended tuned and differentially tuned diode varactor configurations. The back-to-back varactor topology is identified as a suitable solution to linearize the tank capacitance. The amplitude to phase noise conversion is greatly attenuated and the 1/f(3) phase noise is drastically reduced, without impairing the achievable tuning range. These results are validated through circuit simulations in an existing 0.35-mu m CMOS technology.
引用
收藏
页码：481 / 488
页数：8
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