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.
- SourceAvailable from: Hong-Yeh Chang[show abstract] [hide abstract]
ABSTRACT: Reflection-type binary phase-shift keying and in-phase and quadrature modulator monolithic microwave integrated circuits (MMICs) are reported in this paper. These MMICs are fabricated by 1-μm HBT process and evaluated successfully under vector signal characterization. A cold-mode HBT device model with varying bias conditions is proposed, which is suitable for millimeter-wave circuit design and simulation. The analysis and design equations of imbalance effects for the reflection-type modulators are also presented. These MMICs demonstrate measured error vector magnitude of less than 12%, a carrier rejection of better than 15 dB, and an adjacent channel power ratio of better than -21 dBc from 50 to 110 GHz.IEEE Transactions on Microwave Theory and Techniques 04/2004; · 2.23 Impact Factor
Conference Proceeding: A 60-GHz-band Compact IQ Modulator MMIC for Ultra-high-speed Wireless Communication[show abstract] [hide abstract]
ABSTRACT: A 60-GHz-band compact IQ modulator MMIC with a double-balanced mixer configuration is developed for ultra-high-speed wireless transceivers. The IQ modulator includes asymmetric baluns and an LO driver amplifier in a 2.5 mm times 1.15 mm chip to obtain differential signals in a CPW scheme and to mitigate the requirements for LO input power, respectively. The chip size of the CPW balun is markedly reduced by introducing CPS transmission lines in place of lambda/2-lines. When the fabricated modulator MMIC is operated as an SSB mixer, it shows a conversion gain of -11.1 dB at an LO input power of 0 dBm. Under the vector signal measurements, the fabricated modulator shows EVM values of less than 4 % and 5.5 % for QPSK and 16QAM at a symbol rate of 15 Msps in the carrier frequency range of 59 to 66 GHzMicrowave Symposium Digest, 2006. IEEE MTT-S International; 07/2006
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ABSTRACT: This article provides an introduction to a panel session at the 2009 International Microwave Symposium (IMS 2009) on enabling multi-gigabit per second (Gb/s) wireless communication links. Blasting beams of high-speed data through free space is not new. Terahertz spectrum near visible light has been used for ultrahigh-speed optical links for many years. Newly released millimeter-wave (mm-wave) bands provide a similar potential but with different operating characteristics. Advances in manufacturing are yielding high-reliability, high-frequency mm-wave devices, faster digital field programmable gate arrays (FPGA) processors, and superfast analog-to-digital (A/D) and digital-to-analog (D/A) converters that enable higher frequency transceivers, faster modems, and more cost-effective radio architectures that need to be reliably realized. This panel session will explore the technologies being developed within the industry to enable this new field of communications. The strengths and weakness of each technology will be debated, and the viability of each to provide a compelling alternative to fiber will be determined. The panel will bring together leading device engineers with system providers to provide a complete overview of the state-of-the-art Gb/s communications and a road map for the future.IEEE Microwave Magazine 06/2009; · 1.50 Impact Factor