DocumentCode :
1554036
Title :
A 4-Port-Inductor-Based VCO Coupling Method for Phase Noise Reduction
Author :
Deng, Zhiming ; Niknejad, Ali M.
Author_Institution :
MediaTek USA, San Jose, CA, USA
Volume :
46
Issue :
8
fYear :
2011
Firstpage :
1772
Lastpage :
1781
Abstract :
A 4-port-inductor-based voltage-controlled oscillator (VCO) coupling technique is introduced to improve VCO phase noise performance. The analysis of the stability of oscillation modes and the phase noise performance of a coupled oscillator is provided as theoretical fundamental. Four-port inductors are compared with typical two-port inductors, and their superior performance over the latter is demonstrated through analysis and measurements. The design strategies of coupled VCOs using 4-port inductors are discussed. Two coupled VCO topologies, the NMOS-cross-coupled-pair coupled VCO (NCVCO) and the complementary-cross-coupled-pair coupled VCO (CCVCO), are proposed and compared with the conventional NMOS-cross-coupled-pair VCO (NVCO). Prototype designs have been demonstrated to verify the analysis. The 12.8-GHz CCVCO design achieves phase noise of -116 dBc/Hz at 1-MHz offset, a tuning range of 31.4%, and FOM and FOMT of 184 and 194, respectively.
Keywords :
MOS integrated circuits; microwave integrated circuits; microwave oscillators; voltage-controlled oscillators; 4-port-inductor-based VCO coupling method; NMOS-cross-coupled-pair coupled VCO; complementary-cross-coupled-pair coupled VCO; frequency 1 MHz; frequency 12.8 GHz; oscillation modes; phase noise reduction; typical two-port inductors; voltage-controlled oscillator; Couplings; Impedance; Inductors; Phase noise; Voltage-controlled oscillators; 4-port; CMOS; coupling; inductor; inter-locked ring; phase noise; switched-capacitor array; voltage-controlled oscillator (VCO);
fLanguage :
English
Journal_Title :
Solid-State Circuits, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9200
Type :
jour
DOI :
10.1109/JSSC.2011.2155750
Filename :
5876282
Link To Document :
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