Hsieh, H.-H.H.-H.HsiehHsu, Y.-C.Y.-C.HsuLIANG-HUNG LU2020-06-112020-06-11200700189480https://scholars.lib.ntu.edu.tw/handle/123456789/498219https://www.scopus.com/inward/record.uri?eid=2-s2.0-33947110517&doi=10.1109%2fTMTT.2006.890518&partnerID=40&md5=fc0bde0dafd47333f9934b966c571584A multiphase oscillator suitable for 15/30-GHz dual-band applications is presented. In the circuit implementation, the 15-GHz half-quadrature voltage-controlled oscillator (VCO) is realized by a rotary traveling-wave oscillator, while frequency doublers are adopted to generate the quadrature output signals at the 30-GHz frequency band. The proposed circuit is fabricated in a standard 0.18-μm CMOS process with a chip area of 1.1 × 1.0 mm2. Operated at a 2-V supply voltage, the VCO core consumes a dc power of 52 mW. With a frequency tuning range of 250 MHz, the 15-GHz half-quadrature VCO exhibits an output power of -8 dBm and a phase noise of -112 dBc/Hz at 1-MHz offset frequency. The measured power level and phase noise of the 30-GHz quadrature outputs are -16 dBm and -104 dBc/Hz, respectively. © 2007 IEEE.Coplanar striplines (CPSs); Frequency doublers; Half-quadrature output phases; Rotary traveling-wave oscillatorsCoplanar striplines (CPS); Multiphase oscillators; Offset frequency; Rotary traveling wave oscillators; Supply voltage; Bandwidth; CMOS integrated circuits; Electric potential; Frequency bands; Frequency doublers; Phase noise; Variable frequency oscillatorsjournal article10.1109/TMTT.2006.8905182-s2.0-33947110517WOS:000245456200004