Pub Date : 2012-06-17DOI: 10.1109/MWSYM.2012.6258346
K. Tan, C. Lai, Po-Hui Lu, Chia-Hou Tu, Jen-Ming Wu, S. Hsu, G. Huang, Ta-Shun Chu
A 79GHz UWB pulse-compression (PC) vehicular radar system is presented. A PC waveform is a long pulse with internal modulation. The energy of it can be increased without raising the instantaneous peak power. Meanwhile, a PC waveform preserves an equal bandwidth and the range resolution associated with a single pulse waveform. In addition, the PC technique also allows multiple radars operating simultaneously based on the code division multiple accessing (CDMA). In this work, the internal modulation of the PC waveform is binary phase shift keying (BPSK) with a 31-bit length pseudo noise (PN) sequence. The modulation rate is 1 Gb/s and the maximum pulse width is 31 nsec. The CMOS chip presents a self-contained radar system with the transmitter, receiver, frequency synthesizer, and complete timing circuit fully integrated in a standard 90nm CMOS technology.
{"title":"A 79GHz UWB pulse-compression vehicular radar in 90nm CMOS","authors":"K. Tan, C. Lai, Po-Hui Lu, Chia-Hou Tu, Jen-Ming Wu, S. Hsu, G. Huang, Ta-Shun Chu","doi":"10.1109/MWSYM.2012.6258346","DOIUrl":"https://doi.org/10.1109/MWSYM.2012.6258346","url":null,"abstract":"A 79GHz UWB pulse-compression (PC) vehicular radar system is presented. A PC waveform is a long pulse with internal modulation. The energy of it can be increased without raising the instantaneous peak power. Meanwhile, a PC waveform preserves an equal bandwidth and the range resolution associated with a single pulse waveform. In addition, the PC technique also allows multiple radars operating simultaneously based on the code division multiple accessing (CDMA). In this work, the internal modulation of the PC waveform is binary phase shift keying (BPSK) with a 31-bit length pseudo noise (PN) sequence. The modulation rate is 1 Gb/s and the maximum pulse width is 31 nsec. The CMOS chip presents a self-contained radar system with the transmitter, receiver, frequency synthesizer, and complete timing circuit fully integrated in a standard 90nm CMOS technology.","PeriodicalId":6385,"journal":{"name":"2012 IEEE/MTT-S International Microwave Symposium Digest","volume":"1 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2012-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82693030","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 : 2012-06-17DOI: 10.1109/MWSYM.2012.6259637
Peng Liu, S. Sah, Jaeyoung Jung, P. Upadhyaya, D. Heo
A novel low voltage bulk-coupled CMOS LC quadrature voltage controlled oscillator (QVCO) implemented in a standard 0.18 um BiCMOS process is presented in this paper. Quadrature signals are achieved by using injection of output signals of independent complementary LC VCOs into body terminal of each cross-coupled pair. Tapped capacitor technique is used to lower phase noise and achieve load independence. The implemented QVCO achieves a measured phase noise of −95.6 dBc/Hz at 50 KHz offset from 6.26 GHz carrier frequency. The total power consumption is 3.2 mW from a 1.2 V supply. The active die area is only 0.3 mm2. The achieved Figure of Merit (FOM) is −192.5 dBc/Hz and FOMA is −197.7 dBc/Hz which are among the best compared to recently published QVCOs.
{"title":"Load independent bulk-coupled low power quadrature LC VCO","authors":"Peng Liu, S. Sah, Jaeyoung Jung, P. Upadhyaya, D. Heo","doi":"10.1109/MWSYM.2012.6259637","DOIUrl":"https://doi.org/10.1109/MWSYM.2012.6259637","url":null,"abstract":"A novel low voltage bulk-coupled CMOS LC quadrature voltage controlled oscillator (QVCO) implemented in a standard 0.18 um BiCMOS process is presented in this paper. Quadrature signals are achieved by using injection of output signals of independent complementary LC VCOs into body terminal of each cross-coupled pair. Tapped capacitor technique is used to lower phase noise and achieve load independence. The implemented QVCO achieves a measured phase noise of −95.6 dBc/Hz at 50 KHz offset from 6.26 GHz carrier frequency. The total power consumption is 3.2 mW from a 1.2 V supply. The active die area is only 0.3 mm2. The achieved Figure of Merit (FOM) is −192.5 dBc/Hz and FOMA is −197.7 dBc/Hz which are among the best compared to recently published QVCOs.","PeriodicalId":6385,"journal":{"name":"2012 IEEE/MTT-S International Microwave Symposium Digest","volume":"2 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2012-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82915136","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 : 2012-06-17DOI: 10.1109/MWSYM.2012.6258407
Xinshe Yin
More accurate and complete formulas are developed for extraction of coupling parameters of coupled resonator filters. It takes into account of coupling with frequency dependence and source/load phase loading. Impacts of resonator port impedance and position are also discussed. Examples, including a wideband comb-line filter and a narrowband dielectric duplexer, are simulated to verify the validity of the presented formulation. Results showed that the extracted coupling matrix (changes with frequency) has the same response with EM simulation. The new formulas enable more accurate and efficient design of coupled resonator filters.
{"title":"Accurate extraction of coupling matrix for coupled resonator filters","authors":"Xinshe Yin","doi":"10.1109/MWSYM.2012.6258407","DOIUrl":"https://doi.org/10.1109/MWSYM.2012.6258407","url":null,"abstract":"More accurate and complete formulas are developed for extraction of coupling parameters of coupled resonator filters. It takes into account of coupling with frequency dependence and source/load phase loading. Impacts of resonator port impedance and position are also discussed. Examples, including a wideband comb-line filter and a narrowband dielectric duplexer, are simulated to verify the validity of the presented formulation. Results showed that the extracted coupling matrix (changes with frequency) has the same response with EM simulation. The new formulas enable more accurate and efficient design of coupled resonator filters.","PeriodicalId":6385,"journal":{"name":"2012 IEEE/MTT-S International Microwave Symposium Digest","volume":"131 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2012-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86769669","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 : 2012-06-17DOI: 10.1109/MWSYM.2012.6259458
Huan Meng, Ke-Li Wu
This paper presents a direct synthesis method for a general Chebyshev band pass filter that is matched to a general frequency dependent complex load. The method is based on the power wave renormalization theory and the characteristic polynomial representation of a filter network. By renormalizing the termination load impedance, three necessary conditions that stipulate the polynomials associated to a filter matched to a complex load and those related to a unity load are derived. It can be shown that these three conditions can lead to an ideal filter circuit model cascaded by a piece of transmission line between the complex load and the ideal filter. It has been shown that the length of the transmission line is optimal in the sense that the designed filter will best match to a given frequency variant load effect. The proposed method offers a deterministic yet flexible way for optimally designing a diplexer or a multiplexer with a realistic loading effect. The effectiveness of the method is demonstrated by a design example of a waveguide diplexer.
{"title":"Direct optimal synthesis of microwave bandpass filters with a general loading effect","authors":"Huan Meng, Ke-Li Wu","doi":"10.1109/MWSYM.2012.6259458","DOIUrl":"https://doi.org/10.1109/MWSYM.2012.6259458","url":null,"abstract":"This paper presents a direct synthesis method for a general Chebyshev band pass filter that is matched to a general frequency dependent complex load. The method is based on the power wave renormalization theory and the characteristic polynomial representation of a filter network. By renormalizing the termination load impedance, three necessary conditions that stipulate the polynomials associated to a filter matched to a complex load and those related to a unity load are derived. It can be shown that these three conditions can lead to an ideal filter circuit model cascaded by a piece of transmission line between the complex load and the ideal filter. It has been shown that the length of the transmission line is optimal in the sense that the designed filter will best match to a given frequency variant load effect. The proposed method offers a deterministic yet flexible way for optimally designing a diplexer or a multiplexer with a realistic loading effect. The effectiveness of the method is demonstrated by a design example of a waveguide diplexer.","PeriodicalId":6385,"journal":{"name":"2012 IEEE/MTT-S International Microwave Symposium Digest","volume":"63 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2012-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88983550","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 : 2012-06-17DOI: 10.1109/MWSYM.2012.6259670
Yangping Zhao, Taijun Liu, T. Xu, Q. Nie, Yinshui Xia, Rangding Wang, Gangyi Jiang, Yan Ye
This paper proposed a novel varactor-tuned dual-band filter with constant absolute bandwidth. It is composed of a pair of half-wavelength open-ended resonators and a pair of quarter-wavelength short-ended resonators. The resonators utilized two different methods to control the electric and magnetic coupling so as to achieve constant absolute bandwidth. A dual-band tunable filter is designed, and the measured results of the filter illustrate the effectiveness of this design method.
{"title":"Varactor-tuned dual-band filter with constant absolute bandwidth","authors":"Yangping Zhao, Taijun Liu, T. Xu, Q. Nie, Yinshui Xia, Rangding Wang, Gangyi Jiang, Yan Ye","doi":"10.1109/MWSYM.2012.6259670","DOIUrl":"https://doi.org/10.1109/MWSYM.2012.6259670","url":null,"abstract":"This paper proposed a novel varactor-tuned dual-band filter with constant absolute bandwidth. It is composed of a pair of half-wavelength open-ended resonators and a pair of quarter-wavelength short-ended resonators. The resonators utilized two different methods to control the electric and magnetic coupling so as to achieve constant absolute bandwidth. A dual-band tunable filter is designed, and the measured results of the filter illustrate the effectiveness of this design method.","PeriodicalId":6385,"journal":{"name":"2012 IEEE/MTT-S International Microwave Symposium Digest","volume":"120 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2012-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91517185","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 : 2012-06-17DOI: 10.1109/MWSYM.2012.6259688
G. Lei
This paper presents a new method to suppress the power/ground (P/G) plane noise commonly encountered in high-speed digital and mixed-signal systems. This method is based on modifying the conventional power/ground cavity model by utilizing the inhomogeneous medium in the power/ground structure. The usage of this inhomogeneous medium leads to the appearance of the nonconstant-coefficient first-order derivative terms of the model equation. These terms allow us to control and to change the geometrical property of the model solution if the coefficients are properly selected. We will show that by adjusting the parameters of the coefficient functions, the resonance of the structure can be completely eliminated. The Finite-Difference Time-Domain (FDTD) simulation for the power/ground plane structure demonstrates the effectiveness of the method.
{"title":"An efficient and simple approach to suppressing the high-frequency power/ground plane noise","authors":"G. Lei","doi":"10.1109/MWSYM.2012.6259688","DOIUrl":"https://doi.org/10.1109/MWSYM.2012.6259688","url":null,"abstract":"This paper presents a new method to suppress the power/ground (P/G) plane noise commonly encountered in high-speed digital and mixed-signal systems. This method is based on modifying the conventional power/ground cavity model by utilizing the inhomogeneous medium in the power/ground structure. The usage of this inhomogeneous medium leads to the appearance of the nonconstant-coefficient first-order derivative terms of the model equation. These terms allow us to control and to change the geometrical property of the model solution if the coefficients are properly selected. We will show that by adjusting the parameters of the coefficient functions, the resonance of the structure can be completely eliminated. The Finite-Difference Time-Domain (FDTD) simulation for the power/ground plane structure demonstrates the effectiveness of the method.","PeriodicalId":6385,"journal":{"name":"2012 IEEE/MTT-S International Microwave Symposium Digest","volume":"20 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2012-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91531133","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 : 2012-06-17DOI: 10.1109/MWSYM.2012.6259712
Lin Zhu, Kaihua Liu, Qi-jun Zhang, Yongtao Ma, Bo Peng
In this paper, an advanced Neuro-Space Mapping (SM) modeling technique for nonlinear device modeling is proposed. By neural network mapping of the voltage and current signals from the coarse to the fine models, Neuro-SM can modify the behavior of the coarse model to match that of the fine model. The novelty of our work is to introduce a Neuro-SM model combining separate mappings for voltage and current and to derive analytical mapping representation to train the mapping neural networks to learn DC, small and large-signal data. Application examples on modeling MESFET devices and the use of the new model in DC, combined DC,S-parameter and Harmonic balance (HB) simulation demonstrate that our analytical Neuro-SM model matches more closely with the device data than that by the previous Neuro-SM method for modeling large-signal microwave devices.
{"title":"An enhanced analytical Neuro-Space Mapping method for large-signal microwave device modeling","authors":"Lin Zhu, Kaihua Liu, Qi-jun Zhang, Yongtao Ma, Bo Peng","doi":"10.1109/MWSYM.2012.6259712","DOIUrl":"https://doi.org/10.1109/MWSYM.2012.6259712","url":null,"abstract":"In this paper, an advanced Neuro-Space Mapping (SM) modeling technique for nonlinear device modeling is proposed. By neural network mapping of the voltage and current signals from the coarse to the fine models, Neuro-SM can modify the behavior of the coarse model to match that of the fine model. The novelty of our work is to introduce a Neuro-SM model combining separate mappings for voltage and current and to derive analytical mapping representation to train the mapping neural networks to learn DC, small and large-signal data. Application examples on modeling MESFET devices and the use of the new model in DC, combined DC,S-parameter and Harmonic balance (HB) simulation demonstrate that our analytical Neuro-SM model matches more closely with the device data than that by the previous Neuro-SM method for modeling large-signal microwave devices.","PeriodicalId":6385,"journal":{"name":"2012 IEEE/MTT-S International Microwave Symposium Digest","volume":"3 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2012-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88866648","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 : 2012-06-17DOI: 10.1109/MWSYM.2012.6258369
Jun H. Choi, Yuandan Dong, Jim S. Sun, T. Itoh
A polarization friendly rectrodirective array (RDA) is presented. The proposed RDA can receive any polarization and always retransmit the signal back to the interrogator with the predictable (orthogonal) polarization. This added feature can mitigate polarization mismatch loss and provide a more secure communication link. The proposed polarization friendly RDA shows excellent retrodirectivity for various received polarization states.
{"title":"Polarization friendly retrodirective antenna array","authors":"Jun H. Choi, Yuandan Dong, Jim S. Sun, T. Itoh","doi":"10.1109/MWSYM.2012.6258369","DOIUrl":"https://doi.org/10.1109/MWSYM.2012.6258369","url":null,"abstract":"A polarization friendly rectrodirective array (RDA) is presented. The proposed RDA can receive any polarization and always retransmit the signal back to the interrogator with the predictable (orthogonal) polarization. This added feature can mitigate polarization mismatch loss and provide a more secure communication link. The proposed polarization friendly RDA shows excellent retrodirectivity for various received polarization states.","PeriodicalId":6385,"journal":{"name":"2012 IEEE/MTT-S International Microwave Symposium Digest","volume":"33 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2012-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83142148","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 : 2012-06-17DOI: 10.1109/MWSYM.2012.6259391
B. Kim, R. Melamud, R. Candler, M. Hopcroft, T. Kenny
MEMS resonators have been discussed as replacements for quartz crystals in electronics timing applications for more than 40 years. There have been impressive demonstrations of many important characteristics for resonators and oscillators throughout the last 20 years. However, MEMS resonators had always exhibited unacceptable levels of long-term frequency drift. Recent work has shown that placement of MEMS resonators in high-quality packages can eliminate the sources of drift. The emergence of high-quality, low-cost packaging for MEMS resonators has enabled the first demonstrations of long-term stability and opened the door for commercial applications.
{"title":"MEMS packaging for reliable resonators and oscillators","authors":"B. Kim, R. Melamud, R. Candler, M. Hopcroft, T. Kenny","doi":"10.1109/MWSYM.2012.6259391","DOIUrl":"https://doi.org/10.1109/MWSYM.2012.6259391","url":null,"abstract":"MEMS resonators have been discussed as replacements for quartz crystals in electronics timing applications for more than 40 years. There have been impressive demonstrations of many important characteristics for resonators and oscillators throughout the last 20 years. However, MEMS resonators had always exhibited unacceptable levels of long-term frequency drift. Recent work has shown that placement of MEMS resonators in high-quality packages can eliminate the sources of drift. The emergence of high-quality, low-cost packaging for MEMS resonators has enabled the first demonstrations of long-term stability and opened the door for commercial applications.","PeriodicalId":6385,"journal":{"name":"2012 IEEE/MTT-S International Microwave Symposium Digest","volume":"11 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2012-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83687941","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 : 2012-06-17DOI: 10.1109/MWSYM.2012.6259597
J. Grandin
In this paper, the author describes the findings of his study of fifteen representative graduates of the University of Rhode Island International Engineering Program (IEP). The IEP program enables the students to earn a language degree alongside their engineering curriculum and involves one year of immersion study and professional internship abroad. The study seeks to define the long-term impact of the IEP experience on the lives and careers of its students.
{"title":"Global engineering education: What difference does it make?","authors":"J. Grandin","doi":"10.1109/MWSYM.2012.6259597","DOIUrl":"https://doi.org/10.1109/MWSYM.2012.6259597","url":null,"abstract":"In this paper, the author describes the findings of his study of fifteen representative graduates of the University of Rhode Island International Engineering Program (IEP). The IEP program enables the students to earn a language degree alongside their engineering curriculum and involves one year of immersion study and professional internship abroad. The study seeks to define the long-term impact of the IEP experience on the lives and careers of its students.","PeriodicalId":6385,"journal":{"name":"2012 IEEE/MTT-S International Microwave Symposium Digest","volume":"45 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2012-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84640104","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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