Voltage controlled oscillator area reduction in nano-scale CMOS
A 4.3-5.6 GHz (26% tuning range) voltage controlled oscillator (VCO) incorporating MOS bypass capacitors, MOS varactors, cross-coupled transistors, a current source and buffers underneath an inductor is demonstrated in 65-nm CMOS. Use of a simple inverter based buffer enables straightforward placeme...
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Published in | 2014 IEEE Radio Frequency Integrated Circuits Symposium pp. 421 - 424 |
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Main Authors | , , , |
Format | Conference Proceeding |
Language | English |
Published |
IEEE
01.06.2014
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Subjects | |
Online Access | Get full text |
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Summary: | A 4.3-5.6 GHz (26% tuning range) voltage controlled oscillator (VCO) incorporating MOS bypass capacitors, MOS varactors, cross-coupled transistors, a current source and buffers underneath an inductor is demonstrated in 65-nm CMOS. Use of a simple inverter based buffer enables straightforward placement under an inductor. The bypass capacitors and other components are used to form a patterned ground shield that improves inductor Q. The measured phase noise of the VCO is -117dBc/Hz at 1 MHz offset from a 4.3GHz carrier. The VCO power consumption is 4 mW. The circuit occupies an area of 14,400 μm 2 , and exhibits FOMa and FOMta of -202 and -210 dB, respectively. The FOMta is at least 10 dB better than the others in the literature. The area is ~3X smaller compared to that of the VCO with all the components outside of the inductor. |
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ISBN: | 1479938629 9781479938629 |
ISSN: | 1529-2517 2375-0995 |
DOI: | 10.1109/RFIC.2014.6851757 |