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A Push-Push VCO With 13.9-GHz Wide Tuning Range Using Loop-Ground Transmission Line for Full-Band 60-GHz Transceiver

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4 Author(s)
Nakamura, T. ; Central Res. Lab., Hitachi, Ltd., Tokyo, Japan ; Masuda, T. ; Washio, K. ; Kondoh, H.

A 59-GHz push-push voltage-controlled oscillator (VCO)-based on 0.18m SiGe BiCMOS technology-for a full-band 60-GHz transceiver was developed. The VCO uses a loop-ground transmission line (LG-TML) composed of λf0/2 signal lines (half wavelength at fundamental frequency) and λ2f0/4 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 (FOMT) of -189.6 dB.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:47 ,  Issue: 6 )