K- and Q-bands CMOS frequency sources with X-band quadrature VCO

Fully integrated 10-, 20-, and 40-GHz frequency sources are presented, which are implemented with a 0.18-mu m CMOS process. A 10-GHz quadrature voltage-controlled oscillator (QVCO) is designed to have output with a low de level, which can be effectively followed by a frequency multiplier. The proposed multipliers generate signals of 20 and 40 GHz using the harmonics of the QVCO. To have more harmonic power, a frequency doubler with pinchoff clipping is used without any buffers or dc-level shifters. The QVCO has a low phase noise of - 118.67 dBc/Hz at a 1-MHz offset frequency with a 1.8-V power supply. The transistor size effect on phase noise is investigated. The frequency doubler has a low phase noise of -111.67 dBc/Hz at a 1-MHz offset frequency is measured, which is 7 dB higher than a phase noise of the QVCO. The doubler can be tuned between 19.8-22 GHz and the output is -6.83 dBm. A fourth-order frequency multiplier, which is used to obtain 40-GHz outputs, shows a phase noise of -102.0 dBc/Hz at 1-MHz offset frequency with the output power of - 18.0 dBm. A large tuning range of 39.3-43.67 GHz (10%) is observed.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2005-09
Language
ENG
Keywords

NOISE

Citation

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, v.53, no.9, pp.2789 - 2800

ISSN
0018-9480
URI
http://hdl.handle.net/10203/1561
Appears in Collection
EE-Journal Papers(저널논문)
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