Abstract
This paper presents a 142-154 GHz third-harmonic extracted Class-F oscillator featuring an FoM of -177.1 at 1-MHz offset. In this work, a magnetically coupled dual-core topology is applied to enhance the third harmonic for Class-F operation, which also effectively boosts the negative conductance of the oscillator. The boosted negative conductance relaxes the startup condition in the Colpitts oscillator and improves its phase noise. This oscillator is fabricated in a 22-nm CMOS FDSOI. At 154.5 GHz, the measured PN is -87.4 dBc/Hz at 1-MHz offset, and -101.8 dBc/Hz at 10 MHz offset.
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