Pub Date : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616812
Zhang Tao, Liguo Sun
In this paper, a new design of the robust adaptive beamformer (RAB) is developed to overcome the increased computation cost of the traditional RABs. This approach introduces a suboptimal of the distance between the actual array steering vector (ASV) and presumed ASV in tandem with the iterative doubly constrained robust capon beamformer using fixed uncertainty level (Fu-IDCRCB). Then, the uncertainty level of the first iteration is updated by the optimal distance and then the estimated ASV of the first step is in the vicinity of the actual ASV. As a result, the coherent iterations are needed to search the actual ASV with smaller uncertainty set. Hence, this method convergences faster than the other beamfomers (BFs) and the simulation results demonstrate the effectiveness of the proposed BF.
{"title":"Iterative robust beamformer with an estimation of uncertainty level","authors":"Zhang Tao, Liguo Sun","doi":"10.1109/IEEE-IWS.2013.6616812","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616812","url":null,"abstract":"In this paper, a new design of the robust adaptive beamformer (RAB) is developed to overcome the increased computation cost of the traditional RABs. This approach introduces a suboptimal of the distance between the actual array steering vector (ASV) and presumed ASV in tandem with the iterative doubly constrained robust capon beamformer using fixed uncertainty level (Fu-IDCRCB). Then, the uncertainty level of the first iteration is updated by the optimal distance and then the estimated ASV of the first step is in the vicinity of the actual ASV. As a result, the coherent iterations are needed to search the actual ASV with smaller uncertainty set. Hence, this method convergences faster than the other beamfomers (BFs) and the simulation results demonstrate the effectiveness of the proposed BF.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130346149","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616778
Marvin Aidoo, Zhijian Xie, N. Dogan, H. Savci, P. Roblin
In this work, an explanation for the frequency limiting factor through analysis and board level implementation of Rotary Traveling Wave Oscillator (RTWO) is proposed. We also established and demonstrate the relation between frequency limit and the amplification stage. To utilize RTWO for high frequency application, it was realized that, varying the ring size to achieve high frequency signals is governed by a length threshold which when exceeded contribute to signal instability and in some cases the possibility of no oscillation.
{"title":"Study of amplification stage limitation of rotary traveling wave oscillators","authors":"Marvin Aidoo, Zhijian Xie, N. Dogan, H. Savci, P. Roblin","doi":"10.1109/IEEE-IWS.2013.6616778","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616778","url":null,"abstract":"In this work, an explanation for the frequency limiting factor through analysis and board level implementation of Rotary Traveling Wave Oscillator (RTWO) is proposed. We also established and demonstrate the relation between frequency limit and the amplification stage. To utilize RTWO for high frequency application, it was realized that, varying the ring size to achieve high frequency signals is governed by a length threshold which when exceeded contribute to signal instability and in some cases the possibility of no oscillation.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114717528","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616795
Q. Guo
In this paper, a Ku band voltage controlled oscillator with a frequency range of 220MHz is presented. By changing the traditional structure, combining the resonance with the active component through direct coupling, the oscillator becomes easier to oscillate; therefore the performance of the oscillator has been improved. The output power is 4.79dBm and 7.02dBm at 12.24GHz and 12.49GHz, respectively. The control voltage ranges from 1V to 12V. The phase noise is -66.73dBc/Hz@100KHz at 12.49GHz.
{"title":"Design of a Ku-band voltage controlled oscillator","authors":"Q. Guo","doi":"10.1109/IEEE-IWS.2013.6616795","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616795","url":null,"abstract":"In this paper, a Ku band voltage controlled oscillator with a frequency range of 220MHz is presented. By changing the traditional structure, combining the resonance with the active component through direct coupling, the oscillator becomes easier to oscillate; therefore the performance of the oscillator has been improved. The output power is 4.79dBm and 7.02dBm at 12.24GHz and 12.49GHz, respectively. The control voltage ranges from 1V to 12V. The phase noise is -66.73dBc/Hz@100KHz at 12.49GHz.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121941111","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616693
Wensheng Zhao, W. Yin, Yong-xin Guo
Modeling of multi-walled carbon nanotube (MWCNT)-based capacitors is performed in this paper. Their equivalent circuit model is modified with the impacts of quantum capacitance as well as kinetic inductance treated in an appropriate manner. Further, both effective capacitance and quality factor of the MWCNT-based capacitors are predicted even at ultrahigh frequencies, and their self-resonance frequencies are also captured successfully.
{"title":"Electrical modeling of multi-walled carbon nanotube (MWCNT)-based capacitors for high-density RF integration","authors":"Wensheng Zhao, W. Yin, Yong-xin Guo","doi":"10.1109/IEEE-IWS.2013.6616693","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616693","url":null,"abstract":"Modeling of multi-walled carbon nanotube (MWCNT)-based capacitors is performed in this paper. Their equivalent circuit model is modified with the impacts of quantum capacitance as well as kinetic inductance treated in an appropriate manner. Further, both effective capacitance and quality factor of the MWCNT-based capacitors are predicted even at ultrahigh frequencies, and their self-resonance frequencies are also captured successfully.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121596360","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616823
Tianjia Sun, Xiang Xie, Zhihua Wang
In recent years, significant efforts have been made to develop the implantable applications. The increasing functions, performances, and operating time push up the power requirement of the implantable medical microsystems. This has led to the interest in the wireless power transfer (WPT) as a promise way to provide more energy. However, the WPT suffers from some problems including unsatisfied power efficiency, limited transfer distance, unpredictable reliability, thermal issues and other problems. Therefore, this paper investigate in-depth the design challenges of the wireless power transfer for medical microsystems. Both the design concerns at the primary and secondary sides are introduced in-depth. At last, this paper looks in the future and summaries several possible future challenges.
{"title":"Design challenges of the wireless power transfer for medical microsystems","authors":"Tianjia Sun, Xiang Xie, Zhihua Wang","doi":"10.1109/IEEE-IWS.2013.6616823","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616823","url":null,"abstract":"In recent years, significant efforts have been made to develop the implantable applications. The increasing functions, performances, and operating time push up the power requirement of the implantable medical microsystems. This has led to the interest in the wireless power transfer (WPT) as a promise way to provide more energy. However, the WPT suffers from some problems including unsatisfied power efficiency, limited transfer distance, unpredictable reliability, thermal issues and other problems. Therefore, this paper investigate in-depth the design challenges of the wireless power transfer for medical microsystems. Both the design concerns at the primary and secondary sides are introduced in-depth. At last, this paper looks in the future and summaries several possible future challenges.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130712306","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616729
K. Mouthaan, Xiaoming Lu, Feng Hu, ZiJie Hu, A. Taslimi
A review of recently published 60 GHz passive bandpass filters in standard CMOS is presented. With data extracted from the reported measurement results of 28 filters, a comparison table and a set of figures are provided and discussed. The provided data may help designers to access the relative merits of their future designs. Potential future directions and design challenges for 60 GHz passive filters in CMOS are also identified.
{"title":"Status and design challenges of 60 GHz passive bandpass filters in standard CMOS","authors":"K. Mouthaan, Xiaoming Lu, Feng Hu, ZiJie Hu, A. Taslimi","doi":"10.1109/IEEE-IWS.2013.6616729","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616729","url":null,"abstract":"A review of recently published 60 GHz passive bandpass filters in standard CMOS is presented. With data extracted from the reported measurement results of 28 filters, a comparison table and a set of figures are provided and discussed. The provided data may help designers to access the relative merits of their future designs. Potential future directions and design challenges for 60 GHz passive filters in CMOS are also identified.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130855798","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616736
Chia-Hui Yu, Jeng‐Han Tsai, Tian-Wei Huang
A 26.5-29.5 GHz frequency synthesizer (FS) using 90-nm CMOS technology is presented in this paper. To achieve the low-power consumption and low phase-noise performance, a transformer-feedback voltage control oscillator (TF-VCO) and a low supply voltage injection-locked frequency divider (ILFD) and current mode logic divider (CML) are implemented. The frequency synthesizing is accomplished by the programmable multi-modulars frequency divider (MMD). The phase noise of proposed frequency sythesizer is -77 dBc/Hz at 1 MHz offset. The power consumption is 24.2 mW.
{"title":"A low-power Ka-band frequency synthesizer with transformer feedback VCO embedded in 90-nm COMS technology","authors":"Chia-Hui Yu, Jeng‐Han Tsai, Tian-Wei Huang","doi":"10.1109/IEEE-IWS.2013.6616736","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616736","url":null,"abstract":"A 26.5-29.5 GHz frequency synthesizer (FS) using 90-nm CMOS technology is presented in this paper. To achieve the low-power consumption and low phase-noise performance, a transformer-feedback voltage control oscillator (TF-VCO) and a low supply voltage injection-locked frequency divider (ILFD) and current mode logic divider (CML) are implemented. The frequency synthesizing is accomplished by the programmable multi-modulars frequency divider (MMD). The phase noise of proposed frequency sythesizer is -77 dBc/Hz at 1 MHz offset. The power consumption is 24.2 mW.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133081260","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616777
Hossein Kassiri B, M. Deen
A low-power, highly linear CMOS double-balanced mixer for UWB applications is presented. The mixer is designed based on well-known folded architecture and also benefits from DC isolation of RF (Radio Frequency) and LO (Local Oscillator) stages. Stacked NMOS-PMOS gm-boosting topology is used in the design of RF stage. To achieve very low power consumption, this stage is biased in sub-threshold region. Also an ultra-wideband active balun is designed and fabricated to generate differential inputs. The balun is separately characterized and its performance is reported both separately and together with the mixer. The design is implemented using 130 nm CMOS process and is operational from 3.1 to 10.6 GHz. The measured maximum conversion gain shows high value of 14.9 dB for the mixer core. Also, the measured double sideband noise figure has a minimum value of 7.8 dB for the mixer core and 12.9 dB when balun is added. Input (RF and LO) port matching is achieved with reflection of more than 10 dB for the entire band. Furthermore, port-to-port isolation is measured that shows excellent isolation between ports. Measured IIP3 as a good indication of linearity performance is also reported and shows excellent linearity that is a result of techniques used in the design. Finally the mixer core area is measured to be 0.056 mm2 with power dissipation of 623 μW from a 1.2 V supply.
{"title":"Low power highly linear inductorless UWB CMOS mixer with active wideband input balun","authors":"Hossein Kassiri B, M. Deen","doi":"10.1109/IEEE-IWS.2013.6616777","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616777","url":null,"abstract":"A low-power, highly linear CMOS double-balanced mixer for UWB applications is presented. The mixer is designed based on well-known folded architecture and also benefits from DC isolation of RF (Radio Frequency) and LO (Local Oscillator) stages. Stacked NMOS-PMOS gm-boosting topology is used in the design of RF stage. To achieve very low power consumption, this stage is biased in sub-threshold region. Also an ultra-wideband active balun is designed and fabricated to generate differential inputs. The balun is separately characterized and its performance is reported both separately and together with the mixer. The design is implemented using 130 nm CMOS process and is operational from 3.1 to 10.6 GHz. The measured maximum conversion gain shows high value of 14.9 dB for the mixer core. Also, the measured double sideband noise figure has a minimum value of 7.8 dB for the mixer core and 12.9 dB when balun is added. Input (RF and LO) port matching is achieved with reflection of more than 10 dB for the entire band. Furthermore, port-to-port isolation is measured that shows excellent isolation between ports. Measured IIP3 as a good indication of linearity performance is also reported and shows excellent linearity that is a result of techniques used in the design. Finally the mixer core area is measured to be 0.056 mm2 with power dissipation of 623 μW from a 1.2 V supply.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127400304","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616819
S. Ladan, S. Hemour, K. Wu
This paper introduces a simple dual diode rectifier circuit in microstrip technology operating at K-band towards millimeter-wave applications. The designed rectifier circuit has a special architecture that enables the separation of the DC component of the rectified wave from the data-related IF channel. Diode characteristics are discussed for efficiency enhancement which is involved in accurate system simulations. Optimization procedure is carried out in order to maximize the RF-to-DC conversion efficiency. A measured efficiency of 40% for 35 mW input power is achieved for the designed circuit, showing an improvement in efficiency in comparison with previous works. The circuit presents potential applications in the design of integrated microwave and millimeter-wave systems for wireless power transmission and energy harvesting.
{"title":"Towards millimeter-wave high-efficiency rectification for wireless energy harvesting","authors":"S. Ladan, S. Hemour, K. Wu","doi":"10.1109/IEEE-IWS.2013.6616819","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616819","url":null,"abstract":"This paper introduces a simple dual diode rectifier circuit in microstrip technology operating at K-band towards millimeter-wave applications. The designed rectifier circuit has a special architecture that enables the separation of the DC component of the rectified wave from the data-related IF channel. Diode characteristics are discussed for efficiency enhancement which is involved in accurate system simulations. Optimization procedure is carried out in order to maximize the RF-to-DC conversion efficiency. A measured efficiency of 40% for 35 mW input power is achieved for the designed circuit, showing an improvement in efficiency in comparison with previous works. The circuit presents potential applications in the design of integrated microwave and millimeter-wave systems for wireless power transmission and energy harvesting.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116302602","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 : 2013-04-14DOI: 10.1109/IEEE-IWS.2013.6616830
Chun-Yu Lin, Tsung-Hsien Lin
This paper presents a versatile transmitter (TX) architecture. The core of this architecture is based on the phase selection (PS) operation, where the TX signal is generated by selecting proper phase to the TX output. The straightforward selection operation leads to energy-efficient data transmission. This architecture has been previously adopted in realizing energy-efficient TXs for various bio-medical applications. It has been demonstrated that these TXs can support various PSK and FSK modulations schemes and achieved good energy efficiency. In addition to highlighting some of previous works, new results of a 2.4-GHz TX that supports QAM scheme to enhance the spectral efficiency, is presented. Fabricated in a 90-nm CMOS process, the TX demonstrated an energy efficiency as low as 0.079 nJ/bit.
{"title":"Towards a versatile energy-efficient wireless transmitter design for bio-medical applications","authors":"Chun-Yu Lin, Tsung-Hsien Lin","doi":"10.1109/IEEE-IWS.2013.6616830","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2013.6616830","url":null,"abstract":"This paper presents a versatile transmitter (TX) architecture. The core of this architecture is based on the phase selection (PS) operation, where the TX signal is generated by selecting proper phase to the TX output. The straightforward selection operation leads to energy-efficient data transmission. This architecture has been previously adopted in realizing energy-efficient TXs for various bio-medical applications. It has been demonstrated that these TXs can support various PSK and FSK modulations schemes and achieved good energy efficiency. In addition to highlighting some of previous works, new results of a 2.4-GHz TX that supports QAM scheme to enhance the spectral efficiency, is presented. Fabricated in a 90-nm CMOS process, the TX demonstrated an energy efficiency as low as 0.079 nJ/bit.","PeriodicalId":344851,"journal":{"name":"2013 IEEE International Wireless Symposium (IWS)","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116480448","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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