Pub Date : 2012-11-01DOI: 10.1109/RFIT.2012.6401628
T. Thap, K. Houng, Samnang Kuong, Jongsik Lim, D. Ahn
This paper presents a new design method for two-pole transmission line bandpass filters (BPFs) using a closed-loop resonator and coupled lines. The concept of this method is to adjust the length of the closed-loop resonator for Jl2 inverter realization and attenuation poles at desired frequencies. To analyze the filter structure, we start with an equivalent π-network for the closed-loop resonator that can be transformed into J-inverter-based network. The lengths of the closed-loop resonator and coupled lines are determined from the resonance condition and the relationship between J-inverters and resonant susceptance. To demonstrate the practicality of this new method we designed and fabricated a two-pole bandpass filter. The measured and simulated results of the filter show an excellent agreement with each other.
{"title":"A new design for two-pole transmission line bandpass filters using a closed-loop resonator and coupled lines","authors":"T. Thap, K. Houng, Samnang Kuong, Jongsik Lim, D. Ahn","doi":"10.1109/RFIT.2012.6401628","DOIUrl":"https://doi.org/10.1109/RFIT.2012.6401628","url":null,"abstract":"This paper presents a new design method for two-pole transmission line bandpass filters (BPFs) using a closed-loop resonator and coupled lines. The concept of this method is to adjust the length of the closed-loop resonator for Jl2 inverter realization and attenuation poles at desired frequencies. To analyze the filter structure, we start with an equivalent π-network for the closed-loop resonator that can be transformed into J-inverter-based network. The lengths of the closed-loop resonator and coupled lines are determined from the resonance condition and the relationship between J-inverters and resonant susceptance. To demonstrate the practicality of this new method we designed and fabricated a two-pole bandpass filter. The measured and simulated results of the filter show an excellent agreement with each other.","PeriodicalId":187550,"journal":{"name":"2012 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126568594","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 : 2012-11-01DOI: 10.1109/RFIT.2012.6401643
Fei Chen, Wei Zhang, W. Rhee, Jongjin Kim, D. Kim, Zhihua Wang
A low-power regenerative FM-UWB receiver with wideband signal reception and linear FM-AM conversion is implemented in 65nm CMOS for short-range communication systems. Different from the conventional regenerative FM-UWB receiver having the narrowband LNA, the proposed receiver employs a wideband LNA and dual bandpass filters (BPFs) to improve FSK demodulation with a relaxed Q requirement of the BPF. A 3.5-4GHz FM-UWB receiver consisting of a stacked LNA, dual BPFs, two envelop detectors and a subtractor successfully performs FM demodulation through wireless transmission from a 100kb/s FM-UWB transmitter, consuming the total power of 3.8mW.
{"title":"A 3.8mW, 3.5–4GHz regenerative FM-UWB receiver with enhanced linearity by utilizing a wideband LNA and dual bandpass filters","authors":"Fei Chen, Wei Zhang, W. Rhee, Jongjin Kim, D. Kim, Zhihua Wang","doi":"10.1109/RFIT.2012.6401643","DOIUrl":"https://doi.org/10.1109/RFIT.2012.6401643","url":null,"abstract":"A low-power regenerative FM-UWB receiver with wideband signal reception and linear FM-AM conversion is implemented in 65nm CMOS for short-range communication systems. Different from the conventional regenerative FM-UWB receiver having the narrowband LNA, the proposed receiver employs a wideband LNA and dual bandpass filters (BPFs) to improve FSK demodulation with a relaxed Q requirement of the BPF. A 3.5-4GHz FM-UWB receiver consisting of a stacked LNA, dual BPFs, two envelop detectors and a subtractor successfully performs FM demodulation through wireless transmission from a 100kb/s FM-UWB transmitter, consuming the total power of 3.8mW.","PeriodicalId":187550,"journal":{"name":"2012 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129641580","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 : 2012-11-01DOI: 10.1109/RFIT.2012.6401661
Haifeng Sun, K. B. Lee, Li Yuan, Weizhu Wang, S. L. Selvaraj, G. Lo
2-D simulation of AlGaN/GaN HEMTs was carried out in order to investigate the mechanism of short-channel effect in highly scaled transistors. We demonstrate the impact of varying the barrier thickness as well as the gate lengths and show that high aspect ratio (gate length to barrier thickness) larger than 10 can effectively mitigate the short channel effect. We also show the influence of InGaN channel and the work-function of Schottky contacts on short channel effects.
{"title":"Theoretical study of short channel effect in highly scaled GaN HEMTs","authors":"Haifeng Sun, K. B. Lee, Li Yuan, Weizhu Wang, S. L. Selvaraj, G. Lo","doi":"10.1109/RFIT.2012.6401661","DOIUrl":"https://doi.org/10.1109/RFIT.2012.6401661","url":null,"abstract":"2-D simulation of AlGaN/GaN HEMTs was carried out in order to investigate the mechanism of short-channel effect in highly scaled transistors. We demonstrate the impact of varying the barrier thickness as well as the gate lengths and show that high aspect ratio (gate length to barrier thickness) larger than 10 can effectively mitigate the short channel effect. We also show the influence of InGaN channel and the work-function of Schottky contacts on short channel effects.","PeriodicalId":187550,"journal":{"name":"2012 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131161559","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 : 2012-11-01DOI: 10.1109/RFIT.2012.6401648
S. Nagai, N. Negoro, T. Fukuda, N. Otsuka, T. Ueda, T. Tanaka, D. Ueda
We have developed new isolated gate drivers using what we call Drive-by-Microwave technology that enables wireless power transmission of input signals. In order to realize the compactness of the gate driver and to obtain isolated gate signals with enough power to directly drive the switching power devices, we have developed a novel compact butterfly-shaped electro-magnetic resonant coupler (EMRC) that operates with RF converted input signals at 5.8GHz. By integrating this EMRC, one-chip GaN isolated gate driver ICs on a sapphire substrate have been developed and their direct driving of the GaN-GIT power switching devices was successfully demonstrated.
{"title":"A one-chip isolated gate driver with Drive-by-Microwave technologies","authors":"S. Nagai, N. Negoro, T. Fukuda, N. Otsuka, T. Ueda, T. Tanaka, D. Ueda","doi":"10.1109/RFIT.2012.6401648","DOIUrl":"https://doi.org/10.1109/RFIT.2012.6401648","url":null,"abstract":"We have developed new isolated gate drivers using what we call Drive-by-Microwave technology that enables wireless power transmission of input signals. In order to realize the compactness of the gate driver and to obtain isolated gate signals with enough power to directly drive the switching power devices, we have developed a novel compact butterfly-shaped electro-magnetic resonant coupler (EMRC) that operates with RF converted input signals at 5.8GHz. By integrating this EMRC, one-chip GaN isolated gate driver ICs on a sapphire substrate have been developed and their direct driving of the GaN-GIT power switching devices was successfully demonstrated.","PeriodicalId":187550,"journal":{"name":"2012 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123510544","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 : 2012-11-01DOI: 10.1109/RFIT.2012.6401657
Kaixue Ma, Qiong Zou, Shouxian Mou, N. Mahalingam, K. Yeo
A transformer based multiple coupled LC tanks model for on-chip VCO design is introduced. The merits of adoption multiple coupled LC tanks can be Q factor enhancement for the equivalent LC tank of VCO, low power consumption, better amplitude swing and broad tuning range can be obtained. As an illustration case two low power Ku band VCOs using dual LC-tanks with/without feedback designed using a 0.18 μm BiCMOS process for low phase noise or wide tuning range are demonstrated.
{"title":"Transformer based multiple coupled LC tanks for on-chip VCO design and applications","authors":"Kaixue Ma, Qiong Zou, Shouxian Mou, N. Mahalingam, K. Yeo","doi":"10.1109/RFIT.2012.6401657","DOIUrl":"https://doi.org/10.1109/RFIT.2012.6401657","url":null,"abstract":"A transformer based multiple coupled LC tanks model for on-chip VCO design is introduced. The merits of adoption multiple coupled LC tanks can be Q factor enhancement for the equivalent LC tank of VCO, low power consumption, better amplitude swing and broad tuning range can be obtained. As an illustration case two low power Ku band VCOs using dual LC-tanks with/without feedback designed using a 0.18 μm BiCMOS process for low phase noise or wide tuning range are demonstrated.","PeriodicalId":187550,"journal":{"name":"2012 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127722049","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 : 2012-11-01DOI: 10.1109/RFIT.2012.6401666
Z. Duan, Yong-xin Guo, Rui-Feng Xue, M. Je, D. Kwong
For implantable applications, the wireless communication link between implanted devices and external apparatus are often realized by separate links, the power link and the data link. Due to the possible close distance between the power link and the data link, the performance of each will be affected. This study aims to investigate the interference between power link and data link immersed in human tissue.
{"title":"Investigation of the mutual effect between power link and data link for biomedicai applications","authors":"Z. Duan, Yong-xin Guo, Rui-Feng Xue, M. Je, D. Kwong","doi":"10.1109/RFIT.2012.6401666","DOIUrl":"https://doi.org/10.1109/RFIT.2012.6401666","url":null,"abstract":"For implantable applications, the wireless communication link between implanted devices and external apparatus are often realized by separate links, the power link and the data link. Due to the possible close distance between the power link and the data link, the performance of each will be affected. This study aims to investigate the interference between power link and data link immersed in human tissue.","PeriodicalId":187550,"journal":{"name":"2012 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129975436","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 : 2012-11-01DOI: 10.1109/RFIT.2012.6401636
S. Krishnan, S. Bhuyan, O. Kyaw, V. P. Kumar, Wang Wenjiang
This paper analyzes the effect of proximal metallic objects on the energy transfer efficiency of magnetic resonance coupling based wireless charging systems for electric vehicles. It is observed from both the experiment and simulation that the optimum energy transfer efficiency changes dramatically in the presence of a metallic copper sheet in close proximity to the receiving coil. This effect on the efficiency is also seen to be different for different physical spacing between the transmitting and receiving coils. The results show that the presence of metallic objects in the vicinity of the receiving coil have to be carefully considered for each possible usage scenario in order to maintain good energy transfer efficiencies.
{"title":"Effect of proximal metallic objects on the performance of wireless charging systems for electric vehicles","authors":"S. Krishnan, S. Bhuyan, O. Kyaw, V. P. Kumar, Wang Wenjiang","doi":"10.1109/RFIT.2012.6401636","DOIUrl":"https://doi.org/10.1109/RFIT.2012.6401636","url":null,"abstract":"This paper analyzes the effect of proximal metallic objects on the energy transfer efficiency of magnetic resonance coupling based wireless charging systems for electric vehicles. It is observed from both the experiment and simulation that the optimum energy transfer efficiency changes dramatically in the presence of a metallic copper sheet in close proximity to the receiving coil. This effect on the efficiency is also seen to be different for different physical spacing between the transmitting and receiving coils. The results show that the presence of metallic objects in the vicinity of the receiving coil have to be carefully considered for each possible usage scenario in order to maintain good energy transfer efficiencies.","PeriodicalId":187550,"journal":{"name":"2012 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129387482","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 : 2012-11-01DOI: 10.1109/RFIT.2012.6401620
Peiyuan Wan, W. Lang, Rui Jin, Chi Zhang, Pingfen Lin
A front-end unity-gain 1-bit flip-around DAC (FADAC) is exploited in a 12-bit opamp-sharing pipelined ADC, allowing a 1.8-Vpp full-swing input at a 1.1-V supply. The high input swing, coupled with a large feedback factor (≈1) of the FADAC, enables a low-voltage low-power design for a high resolution pipelined ADC. The prototype 12-bit ADC operating at 20-MS/s and 1.1-V supply achieves a 66.4 dB SNDR and 76.7 dB SFDR with a 3 MHz input. The ADC consumes 5.2 mW of power and occupies an active area of 0.44 mm2 in 0.13-μm CMOS.
{"title":"A 1.1-V 12-bit 20-MS/s pipelined ADC with 1.8-Vpp full-swing in 0.13-μm CMOS","authors":"Peiyuan Wan, W. Lang, Rui Jin, Chi Zhang, Pingfen Lin","doi":"10.1109/RFIT.2012.6401620","DOIUrl":"https://doi.org/10.1109/RFIT.2012.6401620","url":null,"abstract":"A front-end unity-gain 1-bit flip-around DAC (FADAC) is exploited in a 12-bit opamp-sharing pipelined ADC, allowing a 1.8-Vpp full-swing input at a 1.1-V supply. The high input swing, coupled with a large feedback factor (≈1) of the FADAC, enables a low-voltage low-power design for a high resolution pipelined ADC. The prototype 12-bit ADC operating at 20-MS/s and 1.1-V supply achieves a 66.4 dB SNDR and 76.7 dB SFDR with a 3 MHz input. The ADC consumes 5.2 mW of power and occupies an active area of 0.44 mm2 in 0.13-μm CMOS.","PeriodicalId":187550,"journal":{"name":"2012 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125487782","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 : 2012-11-01DOI: 10.1109/RFIT.2012.6401665
A. Munir, F. Oktafiani, A. Izzuddin
An ultra wideband (UWB) antenna in enhanced shape and reduced size is proposed for investigation and characterization. The proposed antenna which is intended for surface penetrating radar (SPR) application requiring a narrow period pulse is a monopole type antenna and printed on a dielectric substrate. Based on parametrical studies, the octahedral shape is chosen as it is able to enhance the performance as well as to reduce the size of antenna. The antenna is constructed based on a rectangular microstrip antenna fed by a symmetric T-shaped. Some attempts to investigate and characterize the physical parameter including octahedral patch resizing, transition angle, length of arm, and resistive loading are conducted to achieve the required characteristics and the compactness. From the investigation and characterization results, it shows that the proposed antenna which is deployed on FR-4 Epoxy substrate (relative permittivity of 4.3 and thickness of 1.6mm) with a 50Ω microstrip line feeding technique has the overall size of 50mm × 50mm and satisfies with the operating bandwidth required by the application, i.e. frequency range of 50-5000MHz.
{"title":"Shape enhancement and size reduction of UWB printed monopole antenna","authors":"A. Munir, F. Oktafiani, A. Izzuddin","doi":"10.1109/RFIT.2012.6401665","DOIUrl":"https://doi.org/10.1109/RFIT.2012.6401665","url":null,"abstract":"An ultra wideband (UWB) antenna in enhanced shape and reduced size is proposed for investigation and characterization. The proposed antenna which is intended for surface penetrating radar (SPR) application requiring a narrow period pulse is a monopole type antenna and printed on a dielectric substrate. Based on parametrical studies, the octahedral shape is chosen as it is able to enhance the performance as well as to reduce the size of antenna. The antenna is constructed based on a rectangular microstrip antenna fed by a symmetric T-shaped. Some attempts to investigate and characterize the physical parameter including octahedral patch resizing, transition angle, length of arm, and resistive loading are conducted to achieve the required characteristics and the compactness. From the investigation and characterization results, it shows that the proposed antenna which is deployed on FR-4 Epoxy substrate (relative permittivity of 4.3 and thickness of 1.6mm) with a 50Ω microstrip line feeding technique has the overall size of 50mm × 50mm and satisfies with the operating bandwidth required by the application, i.e. frequency range of 50-5000MHz.","PeriodicalId":187550,"journal":{"name":"2012 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"164 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122187857","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 : 2012-11-01DOI: 10.1109/RFIT.2012.6401598
M. K. Karim, M. Sun, L. Ong, Y. X. Guo, F. Lin, B. Luo
A 60GHz 4×4 circular polarized (CP) patch array antenna with a 90nm CMOS OOK modulator are integrated in low temperature co-fired ceramic (LTCC) substrate to form a SiP transmitter. The CP array shows a 3dB axial ratio (AR) bandwidth of over 8GHz. It has a 3dB beamwidth of 20° and a peak gain of 16.8dBi. Device modeling at 60GHz is done to accurately simulate the lumped components. The CMOS modulator includes a 60GHz oscillator and switchable amplifiers to provide the OOK modulation. The final fabricated 60GHz SiP transmitter prototype measures only 22×13×1.4mm3.
{"title":"SiP-based 60GHz transmitter in LTCC","authors":"M. K. Karim, M. Sun, L. Ong, Y. X. Guo, F. Lin, B. Luo","doi":"10.1109/RFIT.2012.6401598","DOIUrl":"https://doi.org/10.1109/RFIT.2012.6401598","url":null,"abstract":"A 60GHz 4×4 circular polarized (CP) patch array antenna with a 90nm CMOS OOK modulator are integrated in low temperature co-fired ceramic (LTCC) substrate to form a SiP transmitter. The CP array shows a 3dB axial ratio (AR) bandwidth of over 8GHz. It has a 3dB beamwidth of 20° and a peak gain of 16.8dBi. Device modeling at 60GHz is done to accurately simulate the lumped components. The CMOS modulator includes a 60GHz oscillator and switchable amplifiers to provide the OOK modulation. The final fabricated 60GHz SiP transmitter prototype measures only 22×13×1.4mm3.","PeriodicalId":187550,"journal":{"name":"2012 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124800361","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：