A 59-GHz push-push voltage-controlled oscillator (VCO)-based on 0.18-μm SiGe BiCMOS technologyfor a full-band 60-GHz transceiver was developed. The VCO uses a loop-ground transmission line (LG-TML) composed of λ fo/ 2 signal lines (half wavelength at fundamental frequency) and λ 2fo/4 secondary lines (quarter wavelength at second harmonic frequency). The LG-TML makes it possible to output both a large signal at second harmonic frequency and an adequate signal at the fundamental frequency for driving a prescalar, while it prevents the Miller effect of the HBTs in the VCO from increasing and negative conductance from being reduced. As a result, the VCO achieves high output power of +1.5 dBm, while maintaining wide tuning range of 13.9 GHz (26% of the center oscillation frequency). Moreover, it exhibits a low phase noise of -108 dBc/Hz at a 1-MHz offset frequency and achieves a state-of-the-art figure of merit (FOM T) of -189.6 dB.
- IEEE 802.15.3c
- SiGe BiCMOS
- loop-ground transmission line
- millimeter-wave communication
- push-push VCO
ASJC Scopus subject areas
- Electrical and Electronic Engineering