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

被引：37
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
相关论文
共 10 条
[1]   Varactor characteristics, oscillator tuning curves, and AM-FM conversion [J].
Hegazi, E ;
Abidi, AA .
IEEE JOURNAL OF SOLID-STATE CIRCUITS, 2003, 38 (06) :1033-1039
[2]  
Ismail A, 2003, ISSCC DIG TECH PAP I, V46, P98
[3]   RF-CMOS oscillators with switched tuning [J].
Kral, A ;
Behbahani, F ;
Abidi, AA .
IEEE 1998 CUSTOM INTEGRATED CIRCUITS CONFERENCE - PROCEEDINGS, 1998, :555-558
[4]   Frequency dependence on bias current in 5-GHz CMOS VCOs: Impact on tuning range and flicker noise upconversion [J].
Levantino, S ;
Samori, C ;
Bonfanti, A ;
Gierkink, SLJ ;
Lacaita, AL ;
Boccuzzi, V .
IEEE JOURNAL OF SOLID-STATE CIRCUITS, 2002, 37 (08) :1003-1011
[5]   AM-to-PM conversion in varactor-tuned oscillators [J].
Levantino, S ;
Samori, C ;
Zanchi, A ;
Lacaita, AL .
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, 2002, 49 (07) :509-513
[6]  
LIN L, 2000, IEEE INT SOL STAT CI, P204
[7]   DISTORTION IN VARIABLE-CAPACITANCE DIODES [J].
MEYER, RG ;
STEPHENS, ML .
IEEE JOURNAL OF SOLID-STATE CIRCUITS, 1975, SC10 (01) :47-54
[8]  
ROHDE UL, 2000, RF MICROWAVE CIRC DE, P767
[9]   Phase noise degradation at high oscillation amplitudes in LC-tuned VCO's [J].
Samori, C ;
Lacaita, AL ;
Zanchi, A ;
Levantino, S ;
Calì, G .
IEEE JOURNAL OF SOLID-STATE CIRCUITS, 2000, 35 (01) :96-99
[10]   Low-power low-phase-noise differentially tuned quadrature VCO design in standard CMOS [J].
Tiebout, M .
IEEE JOURNAL OF SOLID-STATE CIRCUITS, 2001, 36 (07) :1018-1024
1