@inproceedings{45361fb13d73493f9f24b539f9a4cf1b,
title = "A 19 GHz Circular-Geometry Quad-Core Tail-Filtering Class-F VCO with -115 dBc/Hz Phase Noise at 1 MHz Offset in 65-nm CMOS",
abstract = "This paper presents a CMOS circular-geometry quad-core voltage-controlled oscillator (VCO) with class-F operation and tail filtering to achieve ultra low phase noise in K band. The use of class-F operation in a circular-geometry multicore VCO further lowers phase noise but results in new mode ambiguity. We introduce cross-coupled narrow and thin metal traces in the class-F transformer secondary loop to suppress this new mode ambiguity. Also, we extend the circular geometry design to the VCO tail LC filters, reducing the chip area. A proof-of-concept prototype is fabricated in a standard 65 nm CMOS technology. In measurement, the VCO operates from 17.9 to 20.7 GHz. At 19 GHz, the VCO achieves a phase noise of -115 dBc/Hz at 1 MHz offset with a figure of merit (FoM) of -188.4 dBc/Hz.",
keywords = "Class-F, coupled oscillators, harmonic, mmwave, oscillator, phase noise",
author = "Shuxin Ming and Jin Zhou",
note = "Publisher Copyright: {\textcopyright} 2021 IEEE.; 47th IEEE European Solid State Circuits Conference, ESSCIRC 2021 ; Conference date: 06-09-2021 Through 09-09-2021",
year = "2021",
month = sep,
day = "13",
doi = "10.1109/ESSCIRC53450.2021.9567792",
language = "English (US)",
series = "ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
pages = "303--306",
booktitle = "ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference, Proceedings",
address = "United States",
}