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A low power 0.3-3.8 GHz low-noise mixer with noise cancellation

A low power 0.3-3.8 GHz low-noise mixer with noise cancellat...

2012 IEEE MTT-S International Microwave Workshop Series on Millimeter Wave Wireless technology and Applications, IMWS 2012

作者： Shen, Changguo Li, Zhiqun Institute of RF- and OE-ICs Southeast University China Engineering Research Center of RF-ICs and RF-Systems Ministry of Education Southeast University China Jiangsu Provincial Key Laboratory of Sensor Network Technology Wuxi 214135 China

ISBN: (纸本)9781467309028

This paper shows a low power low-noise mixer in RFCMOS 0.18μm technology that operates between 0.3-3.8GHz. The low power mixer has a Gilbert cell configuration which employs low-noise transconductors designed using the noise-cancelling technique. And the low-noise amplifier designs use the current-reused topology to reduce power consumption and employ a capacitive cross-coupled (CCC) gm-boosting to improve noise performance. This merged front-end achieves 11-17dB power conversion gain, a flat SSB noise figure of 7.3-11dB with IF 2MHz over the whole working range. It only consumes 1.69mA current from a 1.8V supply and its active area occupies only 0.04mm 2. © 2012 IEEE.

关键词： Noise figure

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Design of a low power 2GHz CMOS frequency divider for WSN applications

Design of a low power 2GHz CMOS frequency divider for WSN ap...

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2012 International Conference on Microwave and Millimeter Wave technology, ICMMT 2012

作者： Cao, Qinqing Li, Zhiqun Institute of RF and OE ICs Southeast University Nanjing 210096 China Engineering Research Center of RF-ICs and RF-Systems Ministry of Education Nanjing 210096 China Jiangsu Provincial Key Laboratory of Sensor Network Technology Southeast University Wuxi 214135 China

ISBN: (纸本)9781467321839

A 2 GHz programmable frequency divider is presented in this paper for Chinese and American band WSN applications. The divide ratio can be programmed from 720 to 960. The divider basically consists of a 15/16 dual-modulus prescaler and a programmable pulse-swallow counter. Forward phase switching technique is used to reduce power consumption and avoid glitches. Designed in 0.18-μm CMOS process, the 15/16 prescaler and pulse-swallow occupies a chip area of approximately 60 μm * 90 μm and 85 μm * 85 μm. The post-layout simulation shows that the divider can operate under input frequency ranging from 1GHz to 3GHz and consume 3.24 mW from a single 1.8V supply. © 2012 IEEE.

关键词： Phase locked loops

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A 1.8-V 1.8 GHz LC VCO for WSN application

A 1.8-V 1.8 GHz LC VCO for WSN application

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International High Speed Intelligent Communication Forum (HSIC)

作者： Sheng Zhao Zhiqun Li Engineering Research Center of RF-ICs & RF-Systems Southeast University Jiangsu Provincial Key Laboratory of sensor network technology Wuxi

A 1.8 GHz LC VCO in 1.8-V supply is presented. The VCO achieves low power consumption by optimum selection of inductance in the L-C tank. To increase the tuning range, a three-bit switching capacitor array is used for digital switched tuning. Designed in 0.18μm RF CMOS technology, the proposed VCO achieves a phase noise of -126.2dBc/Hz at 1MHz offset and consumes 1.38mA core current at 1.8-V voltage supply.

关键词： Voltage-controlled oscillators Tuning Phase noise Power demand Wireless sensor networks Switches Inductors

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An Appointment Based MAC Protocol for Wireless sensor networks

An Appointment Based MAC Protocol for Wireless Sensor Networ...

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International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC

作者： Hao Liu Fulong Jiang Guoliang Yao Jiangsu Provincial Key Laboratory of Sensor Network Technology Southeast University Nanjing China National ASIC System Engineering Research Center Southeast University Nanjing China

Several asynchronous duty cycle MAC protocols have been proposed for low power in the wireless sensor networks. However, these proposed MACs pay little attention on the performance degradation in many-to-one communications which is the most common traffic pattern in wireless sensor networks. In this paper, we propose AB-MAC, an appointment based MAC protocol to overcome the effect of channel contention of multiple senders. In AB-MAC, a fusion appointment scheme is proposed to enable scheduled batch transmission for multiple senders with low overhead. This scheme improves the transmission efficiency of the current asynchronous MACs in many-to-one traffic pattern. The experimental results show that, comparing to X-MAC which is a leading asynchronous MAC, AB-MAC can achieve better performance in terms of throughput, latency and energy efficiency.

关键词： Receivers Wireless sensor networks Media Access Protocol Throughput Energy consumption Wireless communication

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Design of a low power 5-GHz frequency synthesizer for WSN applications

Design of a low power 5-GHz frequency synthesizer for WSN ap...

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IEEE International Workshop on Radio-Frequency Integration technology (RFIT)

作者： Zhiqun Li Qinqing Cao Xiaodong Qi Shuangshuang Zheng Jiangsu Provincial Key Laboratory of Sensor Network Technology Southeast University Wuxi China Engineering Research Center of RF-ICs & RF-System Ministry of Education Nanjing China

A fully integrated 5-GHz PLL frequency synthesizer for WSN applications has been designed and implemented in 0.18μm CMOS technology. With automatic current calibration technique (ACC), the VCO could maintain a good performance under a small current consumption of about 0.3mA. Phase switching technique is used in the frequency divider to reduce power consumption. Using a 1.8V supply voltage, the measured power consumption is 12mW and the phase noise is -111.13dBc/Hz at 1MHz offset.

关键词： Frequency synthesizers Voltage-controlled oscillators Wireless sensor networks Power demand Frequency conversion Phase noise Frequency control

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0.5 V 4.8 GHz CMOS LC VCO for WSN application

Jiefangjun Ligong Daxue Xuebao/Journal of PLA University of ...

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Jiefangjun Ligong Daxue Xuebao/Journal of PLA University of Science and technology (Natural Science Edition) 2012年第6期13卷 611-614页

作者： Li, Zhi-Qun Zhao, Sheng Institute of RF and OE-ICs Southeast University Nanjing 210096 China Engineering Research Center of RF-ICs and RF-Systems Ministry of Education Southeast University Nanjing 210096 China Jiangsu Provincial Key Laboratory of Sensor Network Technology Wuxi 214135 China

A 0.5 V 4.8 GHz CMOS LC VCO for WSN application was designed. The VCO uses traditional differential negative-resistance structure. With a switched capacitor array, VCO achieves a large tuning range. Thanks to the combination of voltage-boosting circuit, VCO can have a control voltage larger than the supply voltage. Several technologies like width-length-ratio-adjusting of the transistors were used to optimize phase noise performance. The VCO uses 0.13 μm CMOS technology. The proposed VCO achieves a phase noise less than -115 dBc/Hz@1 MHz, and -121.2 dBc/Hz at most and consumes about 2.6 mA core current at 0.5 voltage supply. The performance of VCO meets the requirement of the design target.

关键词： Phase noise

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Hybrid neural network model application in annual precipitation forecast

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International Journal of u- and e- Service, Science and technology 2012年第4期5卷 21-30页

作者： Ma, Li Li, Xuelian Wang, Jin Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science and Technology Nanjing 210044 China School of Computer and Software Nanjing University of Information Science and Technology Nanjing 210044 China Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science and Technology Nanjing 210044 China

When applied to precipitation forecasting, the mean generating function - optimal subset regression (MGF-OSR) model is limited by its low accuracy and high error, while the back propagation (BP) neural network model has difficulty in learning for matrix selection. This paper proposes a new MGF-OSR-BP model, which uses a MGF to extend original data, an OSR to select the best series as the BP neural network input node and learning matrix, and the resultant data for training. The training procedure determines the number of hidden layers and uses an optimal number of hidden layers for model training. This paper uses the MGF-OSR-BP model to analyze precipitation data from Hangzhou, China, for 53 years, from 1956 to 2008. The 1956-2006 precipitation data are used as the training sample, and the 2007-2008 data are used as the test set data to verify the practicality of the forecast system. A fitting verification is performed using the forecasted data against field measurement data, and the results show that the forecast accuracy is better than that of the MGF-OSR model or the MGF stepwise multiple regression model.

关键词： Backpropagation

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Wavelet weighted multi-modulus blind equalization algorithm based on fractional lower order statistics

Wavelet weighted multi-modulus blind equalization algorithm ...

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作者： Xu, Fang Guo, Yecai Guo, Jun Nanjing University of Information Science and Technology Nanjing Jiangsu 210044 China Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing Jiangsu 210044 China Jiangsu Key Laboratory of Meteorological Observation and Information Processing Nanjing Jiangsu 210044 China

ISBN: (纸本)9783642259883

When environmental noise keeps to fractional lower order α-stable distribution, the convergence performance of the traditional blind equalization algorithm is unstable. To overcome the deficiency, on the basis of combining weighted multi-modulus blind equalization algorithm (WMMA) with fractional lower order statistics (FLOS), a wavelet weighted multi-modulus blind equalization algorithm based on FLOS is proposed. This proposed algorithm uses FLOS to suppress the α-stable noise, utilizes WMMA to adjust the modulus in the cost function, and uses normalized orthogonal wavelet transform to reduce the autocorrelation of the input signals. The computer simulation indicates that the proposed algorithm is suitable for the equalization of higher order QAM signals. Compared with constant modulus algorithm based on FLOS and WMMA based on FLOS, the convergence performance of this proposed algorithm is superior. © Springer-Verlag Berlin Heidelberg 2011.

关键词： Blind equalization

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Research on temperature channel calibration of data-acquisition unit of automatic weather station

Research on temperature channel calibration of data-acquisit...

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IEEE 2011 10th International Conference on Electronic Measurement and Instruments, ICEMI 2011

作者： Wu, Xiangjuan Lv, Wenhua Xing, Hongyan Zou, Yingquan Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science and Technology Nanjing 210044 China Jiangsu Key Laboratory of Meteorological Observation and Information Processing Nanjing University of Information Science and Technology Nanjing 210044 China Meteorological Observation Center China Meteorological Administration Beijing 100081 China

ISBN: (纸本)9781424481590

A method of utilizing active resistance network to calibrate the temperature channel of data-acquisition unit is proposed in this paper. This method changes gate-source voltage by micro-controller so as to simulate the resistance. Compares resistance value measured by data-acquisition unit with the simulated resistances to calibrate the performance of the data-acquisition unit. Take DT50 data-acquisition unit in CAWS600 AWS for an example. By software commands, output current and A/D sample duration time of the data-acquisition unit temperature channel are changed to resolve the problem of parameters mismatch, then this data-acquisition unit is calibrated effectively. The experiment result shows this approach provide a reliable means to calibrate AWS data-acquisition unit. © 2011 IEEE.

关键词： Calibration

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Weighted Multi-Modulus Blind Equalization Algorithm Based on Momentum Term

Weighted Multi-Modulus Blind Equalization Algorithm Based on...

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2011 International Conference on Mechanical engineering and technology(ICMET 2011)

作者： Shijie Guo Fang Xu Wencai Xu Kang Fan College of Physics and Electronic Information Huaibei Normal University Nanjing University of Information Science & Technology Jiangsu Technology and Engineering Center of Meteorological Sensor NetworkJiangsu Key Laboratory of Meteorological Observation and Information Processing

In order to overcome the defects of traditional constant modulus blind equalization algorithm in equalizing higher-order QAM(Quadrature Amplitude Modulation) signals, on the basis of combining the momentum term algorithm and the weighted multi-modulus blind equalization algorithm, Momentum term based Weighted Multi-Modulus blind equalization Algorithm(WMMA) is proposed. In the proposed algorithm, weighted multi-modulus blind equalization algorithm is used to adjust the modulus of the cost function adaptively and momentum term is employed to improve the convergence speed. The simulation results in the underwater acoustic channel show that the proposed algorithm has higher convergence speed and accuracy than Multi-Modulus blind equalization Algorithm(MMA) and Constant Modulus blind equalization Algorithm(CMA).

关键词： blind equalization algorithm,weighted multi-modulus algorithm,momentum term

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