Low Phase Noise Differential Vackar VCO in 0.18 CMOS Technology (original) (raw)
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Microwave and Optical Technology …, 2010
A low phase noise tuned-input tuned-output (TITO) voltage-controlled oscillator (VCO) using PMOS transistors is presented in this article.The TITO-VCO, implemented using a 0.18 μm RF CMOS process, resulted in a phase noise performance of −118 dBc/Hz at 1 MHz offset from the center frequency of 4.7 GHz. The figure-of-merit of the TITO-VCO was 188 dB. To the author's knowledge, this is the first report on the measured performance of differential TITO-VCO implemented using PMOS transistors. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1852–1855, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25341
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Design considerations and performance comparisons for several low phase noise CMOS voltagecontrolled oscillator (VCO) topologies are presented including the Hartley, quadrature Colpitts, Clapp, and tuned-input tunedoutput configurations. An indirect approach for high-frequency signal generation using a VCO coupled with a 2X passive frequency multiplier is also described. Several of the structures are attractive alternatives to the conventional LC tank VCO.