352 research outputs found
Analysis and Design of a Foam-Cladded PMF Link With Phase Tuning in 28-nm CMOS
No full textsponsorship: This work was supported in part by the EU Catrene under Project CA114 WiCON and in part by the Flemish Funding Agency VLAIO under Project IWT.140694. This paper was approved by Guest Editor Kaushik Sengupta. (Corresponding author: Patrick Reynaert.) (EU Catrene|CA114 WiCON, Flemish Funding Agency VLAIO|IWT.140694)status: Publishe
Polymer microwave fibers: a new approach that blends wireline, optical, and wireless communication
No full textA 0.53-THz Subharmonic Injection-Locked Phased Array With 63-μW Radiated Power in 40-nm CMOS
No full text© 2018 IEEE. This paper presents a 0.53-THz subharmonic injection-locked 1×4 phased array based on an injection-locked oscillator (ILO) chain. Thanks to the ILO chain, the phase errors in the phased array can be compensated without introducing power variation. This technique enables accurate beam steering with a 60° scan range in the E-plane at 0.53 THz. A six-stage triple-push oscillator is proposed to generate the signal at 0.53 THz. Compared with a conventional triple-push oscillator, it reduces layout constraints, improves signal balance, and enhances output power by at least 3 dB. The phased array is implemented in 40-nm CMOS. With an injection power of 0 dBm, the injection-locked phased array generates an output frequency from 529 to 534 GHz. At 531.5 GHz, the proposed phased array achieves-12-dBm radiated power and 0.24‰ dc-to-terahertz (THz) efficiency without the use of silicon lens, quartz superstrate, or substrate thinning. The chip consumes 260-mW dc power and occupies an area of 2.5 mm2.sponsorship: This work was supported by the CHIST ERA Project WISDOM (FWO) under Grant G0H5816N. (Corresponding author: Patrick Reynaert.) (CHIST ERA Project WISDOM (FWO)|G0H5816N)status: Publishe
Alternative concepts for wideband Doherty power amplifiers
No full textAs we increasingly develop on technologies such as autonomous driving, Industry 4.0, and cloud computing, the need for reliable and high-speedwireless communication is more crucial than ever. However, increasing the frequency bandwidths and centre frequencies of wireless communication systems to achieve higher data rates leads to physical limitations on the receive input power of RF receivers. To overcome these limitations, the next generation of wireless communication will combine multiple antennas to an active beamforming transceiver system. This is technically challenging, particularly for the power amplifiers, which need to provide high bandwidth, be small in size, and perform energy-efficient amplification for complex modulated signals. In this thesis, the author explores the use of the Doherty power amplifier (DPA) as a potential solution to these challenges. While DPAs have some limitations in terms of bandwidth and area consumption, they are promising to increase the overall energy efficiency of the transceiver system. The author proposes alternative architectures, which promise to provide higher frequency bandwidth and high integrability. Through the development of three prototypes using complementary metal-oxide- semiconductor (CMOS), gallium nitride (GaN) monolithic microwave integrated circuit (MMIC), and hybrid design technologies, the author demonstrates the potential of these wideband designs with 5 dB to 10 dB output power backoff (OBO) while also reducing the area consumed in all used technologies. The proposed architecture also leads to the smallest transmission line based DPA combiners ever reported, which paves the way for energy-efficient, high power amplifiers with highest integration capability
The Reynaert story as a vehicle for intellectual recreation: The case of the Grooten ende nieuwen Reinart de voss
No full textIn the seventeenth century Den grooten ende nieuwen Reinart de voss was written, a Dutch adaptation of the first part of the Low German Reynke de vos that had been published by Ludwig Dietz in Rostock in 1539. The anonymous author transposed the Low German text into Dutch iambic verses and added an enormous commentary, the most learned commentary in the whole European Reynaert tradition. This article studies the relation between Den grooten ende nieuwen Reinart de voss and its source, its properties, and its literary and cultural context. At the end the results are put in a European perspective
Novel broadband transition for rectangular dielectric waveguide to planar circuit board at D-band
No full text
Ontwerp van THz stralers in nanometer CMOS
No full textIn the frequency spectrum, the THz range is located between the millimeter wave and the far field infrared spectrum. There are numerous possible applications in the THz range such as medical/security imaging, spectroscopy, and communication. In these applications, THz signal sources are needed to provide the output signal in a transmitter or provide the LO signal in a heterodyne transceiver. CMOS technologies have the advantage of low cost in volume production and full integration with digital circuits, thus attracting intensive research interest on designing THz circuits in CMOS technologies.
The output power of signal sources need to be high enough to fulfill the requirement of the system. Besides high output power, beam-steering ability of a signal source is also essential as it can replace the bulky and slow mechanical beam-steering approaches. This work focuses on pushing the output power of CMOS THz radiators to higher level and exploring the beam-steering capability
of THz radiator arrays.
In this work, modeling of active device interconnections, design of passive devices and on-chip antennas are introduced in detail. Concept of free-space power combining and phased array are introduced. Topologies for THz signal generation and phase control are investigated.
A new EM-simulation-based modeling method is proposed to develop a lumped model representing the transistor interconnect parasitics. This method can extract parasitic including capacitance, inductance, and resistance, thus making it suitable for circuit design at very high frequency range. The accuracy of the developed model is verified by the measurement of the 0.53-THz radiating
source.
A 525-to-556-GHz radiating source with a dielectric lens antenna is designed and fabricated in 28-nm CMOS. The dielectric lens is designed, fabricated, and mounted on top of the chip to enhance the on-chip antenna performance.
A 510-to-545-GHz radiating source with a novel SIW harmonic power extractor is designed and fabricated in 40-nm CMOS. The SIW harmonic power extractor is co-designed with the tripler. The SIW harmonic power extractor enhances harmonic power generation, performs harmonic power extraction, and provides suppression of unwanted harmonic leakage. It is the first time that an on-chip
SIW has been co-designed with active circuits. This chip achieves the largest frequency tuning range among the silicon signal generators above 0.5 THz.
A 0.53-THz subharmonic injection-locked phased array based on an injection-locked oscillator chain is designed and fabricated in 40-nm CMOS. Thanks to this architecture, the phase error in the phased array is compensated without introducing power variation. This technique enables accurate beam steering with a 60° scan range at 0.53 THz. To increase the output power and DC-to-THz efficiency of the phased array at 0.53 THz, a novel 6-stage triple-push oscillator is proposed to generate the output signal. Compared with a conventional
triple-push oscillator, it reduces layout constraints, improves signal balance, and enhances output power by at least 3 dB. This work is the first silicon phased array above 0.45 THz.
A 0.59-THz beam-steerable coherent radiator array is designed and fabricated in 40-nm CMOS. In order to increase the output power, a large-scale coherent radiator array is needed. In this work, a compact coupling structure is proposed to build a scalable coherent radiator array with beam-steering capability. This work achieves the highest radiated power in all the reported silicon signal sources
above 0.35 THz.status: Publishe
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