A linear 70-95 GHz differential IQ modulator for E-band wireless communication
ABSTRACT In this paper, a direct IQ modulator MMIC with a novel differential architecture, for high speed E-band wireless communication is presented. The IQ modulator consists of two balanced resistive mixer cells, on-chip marchand balun and differential branchline coupler for quadrature LO signal generation. When operating as a single side band mixer, it shows conversion loss of 11 dB and side-band suppression higher than 20 dB. LO to RF isolation and OIP3 have been measured to be more than 30 dB and 13 dBm respectively, throughout the E-band. To the authors' best knowledge this is the first presented resistive IQ-modulator suitable for the full E-band.
Conference Proceeding: A Fundamental Upconverting Gilbert Mixer for 100 GHz Wireless Applications[show abstract] [hide abstract]
ABSTRACT: The design and characterization of an up-converting double balanced Gilbert cell mixer in a 0.5 μm InP DHBT process for applications in the 81-102 GHz range is presented. The process features a 4-metal layer stackup that invites to more complex designs compared to most III-V technologies. The presented mixer is a double balanced Gilbert cell design and includes an LO buffer amplifier as well as RF and LO Marchand baluns integrated on chip. The Gilbert cell mixer show excellent results in terms of; conversion gain of 13 dB, LO-RF isolation of 47 dB, output P1dB equals -10 dBm and the total power consumption is 170 mW. The frequency bandwidth covers 81 to 102 GHz.Compound Semiconductor Integrated Circuit Symposium (CSICS), 2010 IEEE; 11/2010