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A packaged 90-to-300GHz transmitter and 115-to-325GHz coherent receiver in CMOS for full-band continuous-wave mm-wave hyperspectral imaging
(2017)Digest of Technical Papers / IEEE International Solid State Circuits Conference ~ 2017 IEEE International Solid-State Circuits Conference (ISSCC)Millimeter-wave/THz hyperspectral imaging has numerous applications in security, non-destructive evaluation, material characterization, and medical diagnostics [1]. Unlike single-frequency imaging, hyperspectral imaging operates over a wide frequency range and offers spectroscopic information on each imaging pixel. This combines mm-wave/THz high-resolution imaging with spectroscopy and improves detection sensitivity and specificity. In ...Other Conference Item -
A 60GHz on-chip linear radiator with single-element 27.9dBm Psat and 33.1dBm peak EIRP using multifeed antenna for direct on-antenna power combining
(2017)Digest of Technical Papers / IEEE International Solid State Circuits Conference ~ 2017 IEEE International Solid-State Circuits Conference (ISSCC)A major challenge for low-cost silicon-based mm-wave wireless links, e.g., for the 5G communication, is to provide large transmitter (Tx) output power (P out ) with high energy efficiency and linearity from a limited supply voltage, so that the high path loss and limited link budget at mm-wave can be compensated. Power combining is often required for high-power mm-wave Tx. The existing power-combining techniques are mainly in two categories. ...Other Conference Item -
A 60GHz on-chip linear radiator with single-element 27.9dBm Psat and 33.1dBm peak EIRP using multifeed antenna for direct on-antenna power combining
(2017)Digest of Technical Papers / IEEE International Solid State Circuits Conference ~ 2017 IEEE International Solid-State Circuits Conference (ISSCC)A major challenge for low-cost silicon-based mm-wave wireless links, e.g., for the 5G communication, is to provide large transmitter (Tx) output power (P out ) with high energy efficiency and linearity from a limited supply voltage, so that the high path loss and limited link budget at mm-wave can be compensated. Power combining is often required for high-power mm-wave Tx. The existing power-combining techniques are mainly in two categories. ...Other Conference Item -
A dual-band digital-WiFi 802.11a/b/g/n transmitter SoC with digital I/Q combining and diamond profile mapping for compact die area and improved efficiency in 40nm CMOS
(2016)Digest of Technical Papers / IEEE International Solid State Circuits Conference ~ 2016 IEEE International Solid-State Circuits Conference (ISSCC)Digital transmitters (DTX) have gained interest in the past few years because of their potential to provide compact die area, better efficiency due to the switching nature of the power amplifier core, and scaling with CMOS technology [1-3]. Quadrature DTX architecture [1] is favored over polar [3] or outphasing [4] for wideband applications, such as WiFi, because of its ability to scale easily to higher signal bandwidth. Moreover, there ...Other Conference Item -
A multimodality CMOS sensor array for cell-based assay and drug screening
(2015)Digest of Technical Papers / IEEE International Solid State Circuits Conference ~ 2015 IEEE International Solid-State Circuits Conference (ISSCC)Cell-based assays are powerful tools to characterize cell- or tissue-specific physiological behaviors under external biochemical stimuli. External biochemical stimuli trigger endogenous cellular mechanisms that produce a cascade of physiological changes, resulting in easily measurable signals. Cell-based assays are widely used for large-scale drug screening in the pharmaceutical industry, where in vitro cultured cells are used to characterize ...Other Conference Item -
A 28GHz/37GHz/39GHz multiband linear Doherty power amplifier for 5G massive MIMO applications
(2017)Digest of Technical Papers / IEEE International Solid State Circuits Conference ~ 2017 IEEE International Solid-State Circuits Conference (ISSCC)Millimeter-wave fifth-generation (5G) systems will extensively leverage massive multiple-input multiple-output (MIMO) architectures to improve their link performance. These array systems will employ many power amplifiers (PAs) operating at moderate output power (P out ), e.g., 16 PAs each with +7dBm P out [1]. The PA energy efficiency is of paramount importance in MIMO systems for improved battery life and thermal management. Due to ...Other Conference Item -
A 60GHz CMOS Power Amplifier with Cascaded Asymmetric Distributed-Active-Transformer Achieving Watt-Level Peak Output Power with 20.8% PAE and Supporting 2Gsym/s 64-QAM Modulation
(2019)2019 IEEE International Solid-State Circuits Conference (ISSCC)Since its invention in early 2000s, Distributed Active Transformer (DAT) has been a popular power-combiner technique for high-power high-efficiency Power Amplifiers (PAs) in voltage-limited Silicon processes at GHz frequencies [1, 2]. However, successful DAT implementations at high mm-wave frequencies still remain elusive. Substantial inter-winding capacitance causes asymmetry in impedance transformation among the DAT sections, resulting ...Other Conference Item -
A 24dBm 2-to-4.3GHz wideband digital Power Amplifier with built-in AM-PM distortion self-compensation
(2017)Digest of Technical Papers / IEEE International Solid State Circuits Conference ~ 2017 IEEE International Solid-State Circuits Conference (ISSCC)Modern wireless systems often support multi-standards with spectrum-efficient modulation schemes such as 64QAM and 256QAM and high data-rates. This poses stringent requirements on RF Power Amplifiers (PAs) for their carrier bandwidth, linearity, modulation rate, and efficiency. Several multiband Analog PAs (APAs) and Digital PAs (DPAs) are recently reported. However, multiband APAs often suffer from low power efficiency [1]. Although ...Other Conference Item -
A mm-Wave 3-Way Linear Doherty Radiator with Multi Antenna Coupling and On-Antenna Current-Scaling Series Combiner for Deep Power Back-Off Efficiency Enhancement
(2019)2019 IEEE International Solid-State Circuits Conference (ISSCC)There is a growing interest in exploring antenna-electronic co-designs that leverage antennas (including their low-loss metal structures, design versatility, multi-feed driving capabilities) as a new design paradigm to radically advance mm-wave front-end performance. In particular, enhancing the peak/back-off transmitting efficiency is essential for future mm-wave wireless communications, such as 5G, which will predominantly use complex ...Other Conference Item -
A 62-to-68GHz linear 6Gb/s 64QAM CMOS doherty radiator with 27.5%/20.1% PAE at peak/6dB-back-off output power leveraging high-efficiency multi-feed antenna-based active load modulation
(2018)2018 IEEE International Solid-State Circuits Conference (ISSCC)Extreme throughput requirements on future mm-wave systems, e.g., 5G links, necessitates the use of spectrum-efficient modulations that often come with high peak-to-average power ratios (PAPRs). Therefore, there is an increasing need for mm-wave power amplifiers (PAs) with high power back-off (PBO) efficiency, so that wideband large-PAPR signals can be transmitted with high energy efficiency. Among various PA PBO efficiency-enhancement ...Other Conference Item