Pub Date : 2015-11-01DOI: 10.1109/COMCAS.2015.7360441
J. Vovnoboy, Run Levinger, D. Elad
The charge pump circuit is a crucial building block of most analog phase synthesizers. Furthermore, it's noise usually dominates the synthesizer's in-band phase noise and can also degrade the out-of-band phase noise due to insufficient suppression. In this paper we present a simple modification to a differential current steering charge pump, without the use of op-amps, which inherently suppress the out-of-band noise by more then 10 dB, allowing simpler and more robust synthesizer architecture.
{"title":"Charge pump architecture with reduced medium and high frequency noise","authors":"J. Vovnoboy, Run Levinger, D. Elad","doi":"10.1109/COMCAS.2015.7360441","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360441","url":null,"abstract":"The charge pump circuit is a crucial building block of most analog phase synthesizers. Furthermore, it's noise usually dominates the synthesizer's in-band phase noise and can also degrade the out-of-band phase noise due to insufficient suppression. In this paper we present a simple modification to a differential current steering charge pump, without the use of op-amps, which inherently suppress the out-of-band noise by more then 10 dB, allowing simpler and more robust synthesizer architecture.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133386352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We propose a novel scheme of realizing all-optical logic gates based on a single I/Q modulator and direct detection by adjusting bias voltages of the two arms, peak-peak voltages of the driving signals and the phase shift. Experiments are successfully carried out to demonstrate four logic gates of OR, AND, XOR and NOR at the bit rate of 1Gbit/s with extinction ratio higher than 11 dB.
{"title":"Experimental demonstration of high-speed logic gates of OR, AND, XOR and NOR in optical domain based on a single I/Q modulator and direct detection","authors":"Xianfeng Tang, Lu Sun, Donghe Zhao, Yiqiao Feng, Xiaoguang Zhang, Lixia Xi, Wenbo Zhang","doi":"10.1109/COMCAS.2015.7360479","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360479","url":null,"abstract":"We propose a novel scheme of realizing all-optical logic gates based on a single I/Q modulator and direct detection by adjusting bias voltages of the two arms, peak-peak voltages of the driving signals and the phase shift. Experiments are successfully carried out to demonstrate four logic gates of OR, AND, XOR and NOR at the bit rate of 1Gbit/s with extinction ratio higher than 11 dB.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114557807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/COMCAS.2015.7360498
A. Bar-Cohen, J. Maurer, A. Sivananthan
While gallium nitride (GaN) is attracting broad attention as the wide bandgap material of choice for both industrial and defense applications, thermal impediments present a significant barrier to full exploitation of its inherently high electron sheet charge density and electrical breakdown voltage. For the last four years, the Defense Advanced Research Projects Agency (DARPA) has pursued research focused on reduction of near-junction thermal resistance through use of diamond substrates and convective and evaporative microfluidics. The options, challenges, and techniques associated with the development of this embedded thermal management technology are described, with emphasis on the accomplishments and status of efforts related to GaN power amplifiers.
{"title":"Near-junction microfluidic thermal management of RF power amplifiers","authors":"A. Bar-Cohen, J. Maurer, A. Sivananthan","doi":"10.1109/COMCAS.2015.7360498","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360498","url":null,"abstract":"While gallium nitride (GaN) is attracting broad attention as the wide bandgap material of choice for both industrial and defense applications, thermal impediments present a significant barrier to full exploitation of its inherently high electron sheet charge density and electrical breakdown voltage. For the last four years, the Defense Advanced Research Projects Agency (DARPA) has pursued research focused on reduction of near-junction thermal resistance through use of diamond substrates and convective and evaporative microfluidics. The options, challenges, and techniques associated with the development of this embedded thermal management technology are described, with emphasis on the accomplishments and status of efforts related to GaN power amplifiers.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116821251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/COMCAS.2015.7360453
C. Mazière, D. Gapillout, A. Xiong, T. Gasseling
This paper presents new identification methodologies dedicated to packaged transistor behavioral modeling. Using the background of the Poly-Harmonic Distortion (PHD) model formalism, the extension of the model kernels description up to the third order makes the behavioral model more robust and accurate for a wide range of impedance loading conditions, which is a primordial when designing a High Power Added Efficiency Doherty Amplifier, where a load impedance variation can be observed as a function of the power level. In this paper, a model of a 15 W GaN Packaged Transistor has been extracted from Load Pull measurements for Class AB and Class C conditions. This new Enhanced PHD model (EPHD) and the original PHD model are benchmarked against Load Pull measurements in order to check the new formulation. An advanced validation at the circuit level was done in order to verify the ability of the EPHD model to predict the overall Doherty Amplifier performances.
{"title":"High efficiency Doherty Power Amplifier design using Enhanced Poly-Harmonic Distortion model","authors":"C. Mazière, D. Gapillout, A. Xiong, T. Gasseling","doi":"10.1109/COMCAS.2015.7360453","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360453","url":null,"abstract":"This paper presents new identification methodologies dedicated to packaged transistor behavioral modeling. Using the background of the Poly-Harmonic Distortion (PHD) model formalism, the extension of the model kernels description up to the third order makes the behavioral model more robust and accurate for a wide range of impedance loading conditions, which is a primordial when designing a High Power Added Efficiency Doherty Amplifier, where a load impedance variation can be observed as a function of the power level. In this paper, a model of a 15 W GaN Packaged Transistor has been extracted from Load Pull measurements for Class AB and Class C conditions. This new Enhanced PHD model (EPHD) and the original PHD model are benchmarked against Load Pull measurements in order to check the new formulation. An advanced validation at the circuit level was done in order to verify the ability of the EPHD model to predict the overall Doherty Amplifier performances.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"226 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133576161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/COMCAS.2015.7360379
A. Zhuravlev, V. Razevig, S. Ivashov, A. Bugaev, M. Chizh
This paper describes a setup for experimental simulation of the signal obtained in electronically switched sparse antenna arrays by independently moving one transmit and one receive antennas. The concept of the system is given with detailed description of the current working realization and the methodology of conducting experiments. Examples of acquired radar signals are presented with corresponding radar images obtained after processing. Potential applications of the setup system in a variety of research projects are given. Further improvements of the system are suggested.
{"title":"Experimental simulation of multi-static radar with a pair of separated movable antennas","authors":"A. Zhuravlev, V. Razevig, S. Ivashov, A. Bugaev, M. Chizh","doi":"10.1109/COMCAS.2015.7360379","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360379","url":null,"abstract":"This paper describes a setup for experimental simulation of the signal obtained in electronically switched sparse antenna arrays by independently moving one transmit and one receive antennas. The concept of the system is given with detailed description of the current working realization and the methodology of conducting experiments. Examples of acquired radar signals are presented with corresponding radar images obtained after processing. Potential applications of the setup system in a variety of research projects are given. Further improvements of the system are suggested.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124729422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/COMCAS.2015.7360399
Vitaly Zatkovetsky, S. Levin, A. Heiman, S. Levy, D. Mistele, S. Shapira
Power Management Integrated Circuits (PMIC) chips contain large power switches - usually LDMOS transistors, along with low current control circuitry. During transistor switching, charge carriers are injected into the substrate and affect the surrounding devices. In junction isolated technologies, hole injection is effectively suppressed using highly doped n-type layers, while electron injection requires separating the highly doped layer from the drain of the device. However, this architecture forms a parasitic NPN transistor, which conducts the injected electrons to the isolation layer causing efficiency losses. We present here a method to improve the efficiency of the switch, by altering the semiconductor doping and thus tuning the gain of the parasitic bipolar. A clear tradeoff between gain and breakdown of the parasitic NPN is discussed.
{"title":"Increase of convertor efficiency and suppression of parasitic bipolar by means of process optimization","authors":"Vitaly Zatkovetsky, S. Levin, A. Heiman, S. Levy, D. Mistele, S. Shapira","doi":"10.1109/COMCAS.2015.7360399","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360399","url":null,"abstract":"Power Management Integrated Circuits (PMIC) chips contain large power switches - usually LDMOS transistors, along with low current control circuitry. During transistor switching, charge carriers are injected into the substrate and affect the surrounding devices. In junction isolated technologies, hole injection is effectively suppressed using highly doped n-type layers, while electron injection requires separating the highly doped layer from the drain of the device. However, this architecture forms a parasitic NPN transistor, which conducts the injected electrons to the isolation layer causing efficiency losses. We present here a method to improve the efficiency of the switch, by altering the semiconductor doping and thus tuning the gain of the parasitic bipolar. A clear tradeoff between gain and breakdown of the parasitic NPN is discussed.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127401236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/COMCAS.2015.7360466
D. Rotshild, Y. Azoulay, M. Ochana, A. Shulzinger, A. Abramovich
In this study we present a concept of real-time and very inexpensive sensor for detection and recognition of micro poisons in aqueous solutions. The method is based on combination of advanced millimeter Wavelength (MMW) spectroscopy system and perfect absorber metamaterial (MM). The designed absorption line of the perfect absorber MM moves slightly due to substance presents in vicinity to the perfect absorber. This change is measured by a high-resolution and sensitive MMW spectroscopy system.
{"title":"Real time detection and recognition of micro-poisons in aqueous solutions and atmosphere using perfect absorber metamaterial in millimeter wavelength regime","authors":"D. Rotshild, Y. Azoulay, M. Ochana, A. Shulzinger, A. Abramovich","doi":"10.1109/COMCAS.2015.7360466","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360466","url":null,"abstract":"In this study we present a concept of real-time and very inexpensive sensor for detection and recognition of micro poisons in aqueous solutions. The method is based on combination of advanced millimeter Wavelength (MMW) spectroscopy system and perfect absorber metamaterial (MM). The designed absorption line of the perfect absorber MM moves slightly due to substance presents in vicinity to the perfect absorber. This change is measured by a high-resolution and sensitive MMW spectroscopy system.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129978656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/COMCAS.2015.7360475
I. Gaspard
In this paper the polarization properties of the indoor radio channel are investigated. By means of a ray tracing approach different combinations of polarization of antennas at the transmitter as well at the receiver end of the communication link are compared with respect to statistics of the channel gain varying due to multipath propagation. Diffuse scattering is taken into account by a single parameter derived from measurements. Some practical consequences for wireless short range communication in smart home applications at around 1 GHz will be given and the results confirm a former measurement campaign.
{"title":"Polarization properties of the indoor radio channel","authors":"I. Gaspard","doi":"10.1109/COMCAS.2015.7360475","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360475","url":null,"abstract":"In this paper the polarization properties of the indoor radio channel are investigated. By means of a ray tracing approach different combinations of polarization of antennas at the transmitter as well at the receiver end of the communication link are compared with respect to statistics of the channel gain varying due to multipath propagation. Diffuse scattering is taken into account by a single parameter derived from measurements. Some practical consequences for wireless short range communication in smart home applications at around 1 GHz will be given and the results confirm a former measurement campaign.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127554850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/COMCAS.2015.7360388
L. Anishchenko, Ekatherina Gaysina
The work presents a feasibility study on the possible bioradar devices usage for contactless monitoring of the laboratory animals respiratory rhythm. Experiments are performed in laboratory conditions on sleeping rats by using two SFCW radars operating at frequency ranges of 3.6-4.0 GHz and 13.8-14.2 GHz. Respiration pattern and movement activity of a rat were monitored by each radar. Experimental results analysis revealed that usage of higher probing frequencies is more preferable and allows reliable estimation of respiratory pattern of laboratory animals in sleep.
{"title":"Comparison of 4 GHz and 14 GHz SFCW radars in measuring of small laboratory animals vital signs","authors":"L. Anishchenko, Ekatherina Gaysina","doi":"10.1109/COMCAS.2015.7360388","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360388","url":null,"abstract":"The work presents a feasibility study on the possible bioradar devices usage for contactless monitoring of the laboratory animals respiratory rhythm. Experiments are performed in laboratory conditions on sleeping rats by using two SFCW radars operating at frequency ranges of 3.6-4.0 GHz and 13.8-14.2 GHz. Respiration pattern and movement activity of a rat were monitored by each radar. Experimental results analysis revealed that usage of higher probing frequencies is more preferable and allows reliable estimation of respiratory pattern of laboratory animals in sleep.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124452922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/COMCAS.2015.7360486
D. Zrnic
This paper identifies the most challenging requirements for weather observations that a future Polarimetric Phased Array Radar (PPAR) should meet. These are routed in the current capabilities of the US national network of Doppler Weather Radars (WSR-88D). Biases in polarimetric variables are related to the PPAR designs and polarimetric mode of operations. A planar-array PPAR being used for resolving some technical challenges is described.
{"title":"Weather measurements with multi-mission phased array radar challenges to meet requirements","authors":"D. Zrnic","doi":"10.1109/COMCAS.2015.7360486","DOIUrl":"https://doi.org/10.1109/COMCAS.2015.7360486","url":null,"abstract":"This paper identifies the most challenging requirements for weather observations that a future Polarimetric Phased Array Radar (PPAR) should meet. These are routed in the current capabilities of the US national network of Doppler Weather Radars (WSR-88D). Biases in polarimetric variables are related to the PPAR designs and polarimetric mode of operations. A planar-array PPAR being used for resolving some technical challenges is described.","PeriodicalId":431569,"journal":{"name":"2015 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems (COMCAS)","volume":"529 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123083386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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