Abstract
A transformer-based enhanced-magnetic-tuning technique is presented to tune the frequency of millimeter-wave oscillators. By switching the polarity of the phase shift of the coupling currents, both of the two intrinsic modes in a quadrature VCO (QVCO) are exploited to achieve ultra-wide frequency tuning range. Designed and implemented in 65nm CMOS process, the QVCO with proposed bimodal enhanced-magnetic-tuning measures a continuous tuning range of 24% from 48.8 to 62.3 GHz and phase noise of -90 to -94 dBc/Hz at 1MHz offset while drawing 13 to 25 mA from 1.2-V supply, corresponding to FoM from 173 to 176 dBc and FoM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">T</sub> from 181 to 184 dBc.
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