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Mixer-First Extremely Wideband 4397 GHz RX Frontend with Broadband Quadrature Input Matching and Current Mode Transformer-Based Image Rejection for Massive MIMO Applications
(2020)2020 IEEE Custom Integrated Circuits Conference (CICC)This work presents an ultra-wideband mixer-first front-end that can cover mmWave communications bands in the frequency range 43-97 GHz. The front-end employs a mmWave 90°coupler as an input stage in order to achieve wideband matching and RF quadrature signal generation. Passive mixer and multi-gated gm3-cancellation IF amplifiers used to achieve and maintain high linearity across the frequency range. In addition, the frond-end implements ...Conference Paper -
Wide FoV Autonomous Beamformer Supporting Multiple Beams and Multi-Band Operation for 5G Mobile Fronthaul
(2020)2020 Optical Fiber Communications Conference and Exhibition (OFC)An autonomous beamformer covering 24-37 GHz for fiber-wireless network demonstrates multi-beam and multi-band signal transmission with wide-FoV (110 o -180 o ) self-steering beam-tracking/-forming over a 10-km fiber and 56-cm wireless link for future dynamic 5G-NR fronthaul applications.Conference Paper -
A 5GHz all-passive negative feedback network for RF front-end self-steering beam-forming with zero DC power consumption
(2016)2016 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)This paper presents an all-passive negative feedback network to perform autonomous RF front-end beam-forming towards the direction of the incident RF beam. The beam-forming front-end block consists of a passive network for RF signal processing, voltage rectifiers, and voltage-controlled phase shifters, all of which are passive components and consume zero DC power. A proof-of-concept 4-element self-steering beam-forming block at 5GHz is ...Conference Paper -
A CMOS Multimodality In-Pixel Electrochemical and Impedance Cellular Sensing Array for Massively Paralleled Synthetic Exoelectrogen Characterization
(2020)2020 IEEE International Solid- State Circuits Conference - (ISSCC)Electrochemically active bacteria (exoelectrogens) are a class of microorganisms capable of transferring electrons between intracellular and exocellular environments, which generate or consume electrical currents via multiple biochemical redox reactions. This unique attribute allows exoelectrogens to interface between biological environments and electronics for a myriad of hybrid “abiotic-biotic” systems and applications, such as small ...Conference Paper -
4.2 An E-Band High-Linearity Antenna-LNA Front-End with 4.8dB NF and 2.2dBm IIP3 Exploiting Multi-Feed On-Antenna Noise-Canceling and Gm-Boosting
(2020)2020 IEEE International Solid- State Circuits Conference - (ISSCC)In this paper, we explore the antenna-electronics co-design concept on RX topologies to enhance key RX performance at high mm-wave frequencies, such as NF and linearity. For proof-of-concept, we present an E-band high-linearity muiti-feed-antenna-LNA co-designed front-end in a 45nm CMOS SOI process that supports applications like wireless back -haul and automotive radar. It exploits on -antenna noise -canceling, g m -boosting, and ...Conference Paper -
24.6 An Instantaneously Broadband Ultra-Compact Highly Linear PA with Compensated Distributed-Balun Output Network Achieving >17.8dBm P1dB and >36.6% PAEP1dB over 24 to 40GHz and Continuously Supporting 64-/256-QAM 5G NR Signals over 24 to 42GHz
(2020)2020 IEEE International Solid- State Circuits Conference - (ISSCC)5G communication promises 10× to 100× data-rate increase to radically change future wireless connectivity. Millimeter-wave (mm-wave) bands can potentially deliver extreme data rates and capacity compared to 10w-GHz bands. The 3GPP 5G NR standard specifies n257 band (26.50 to 29.50GHz), n258 band (24.25 to 27.50GHz), and n260 band (37.00 to 40.00GHz) for Frequency Range 2 (FR2) [1]. Different FR2 bands or their subsets are adopted by various ...Conference Paper -
24.3 A 28GHz Current-Mode Inverse-Outphasing Transmitter Achieving 40%/31% PA Efficiency at Psat/6dB PBO and Supporting 15Gbit/s 64-QAM for 5G Communication
(2020)2020 IEEE International Solid- State Circuits Conference - (ISSCC)As mm-wave offers broader spectra and proportionate capacity increase, it will be extensively employed in 5G-and-beyond communication systems to address the exponentially growing data-rate demand. Viable mm-wave TX or PA solutions should handle multi-Gbit/s complex modulations with large PAPR, pushing the already stringent linearity-efficiency requirement on deployed TXs/PAs. This demand has stimulated extensive research on new TX/PA ...Conference Paper -
24.2 A Reconfigurable Series/Parallel Quadrature-Coupler-Based Doherty PA in CMOS SOI with VSWR Resilient Linearity and Back-Off PAE for 5G MIMO Arrays
(2020)2020 IEEE International Solid- State Circuits Conference - (ISSCC)Modern mm-wave 5G links rely extensively on phased arrays to achieve high array gain for sufficient coverage. However, the proximity of antenna elements often results in element-to-element coupling, which leads to significant element-level antenna-impedance mismatches (i.e., poor VSWR), depending on element locations and beamforming settings. Such array VSWR, often rapidly changing due to fast beamforming, severely degrades mm-wave ...Conference Paper -
A Scalable Active THz Frequency Multiplier Chain in Silicon with Multi-Phase Sub-Harmonic Injection Locking for Bandwidth Extension
(2015)2015 Asia-Pacific Microwave Conference (APMC)This paper presents a multi-phase sub-harmonic injection locking technique for terahertz (THz) signal generation with bandwidth extension. Utilizing this multi-phase technique, a scalable and cascadable "active frequency multiplier" chain architecture is proposed to generate a THz signal from a lower-frequency reference source. A multi-ring system topology is also proposed to facilitate the implementation. As a proof-of-concept design, a ...Conference Paper -
Deep Learning Assisted End-to-End Synthesis of mm-Wave Passive Networks with 3D EM Structures: A Study on A Transformer-Based Matching Network
(2021)2021 IEEE MTT-S International Microwave Symposium (IMS)This paper presents a deep learning assisted synthesis approach for direct end-to-end generation of RF/mm-wave passive matching network with 3D EM structures. Different from prior approaches that synthesize EM structures from target circuit component values and target topologies, our proposed approach achieves the direct synthesis of the passive network given the network topology from desired performance values as input. We showcase the ...Conference Paper