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Design and optimization of a 0.5 V CMOS LNA for 2.4-GHz WSN application

Journal of Semiconductors 2012年第10期33卷 109-115页

作者：陈亮李智群 Institute of RF-&OE-ICs Southeast University Engineering Research Center of RF-ICs&RF-Systems Ministry of EducationSoutheast University Jiangsu Provincial Key Laboratory of Sensor Network Technology

This paper presents a low noise amplifier（LNA）,which could work at an ultra-low voltage of 0.5 V and was optimized for WSN application using 0.13μm RF-CMOS *** circuit was analyzed and a new optimization method for a folded cascode LNA was *** results of the proposed circuit demonstrated a power gain of 14.13 dB,consuming 3 mW DC power,showing 1.96 dB NF and an input 1-dB compression point of -19.9 *** input power matching（S_（11）） and output power matching（S_（22）） were below -10 *** results indicate that this LNA is fully applicable to low voltage and low power applications.

关键词： LNA WSN CMOS

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Design of low power common-gate low noise amplifier for 2.4 GHz wireless sensor network applications

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Journal of Semiconductors 2012年第10期33卷 85-91页

作者：张萌李智群 Institute of RF-&OE-ICs Southeast University Engineering Research Center of RF-ICs&RF-Systems Ministry of EducationSoutheast University Jiangsu Provincial Key Laboratory of Sensor Network Technology

This paper presents a differential low power low noise amplifier designed for the wireless sensor network （WSN） in a TSMC 0.18μm RF CMOS process.A two-stage cross-coupling cascaded common-gate（CG） topology has been designed as the *** first stage is a capacitive cross-coupling *** can reduce the power and noise *** second stage is a positive feedback cross-coupling topology,used to set up a negative resistance to enhance the equivalent Q factor of the inductor at the load to improve the gain of the LNA.A differential inductor has been designed as the load to achieve reasonable *** inductor has been simulated by the means of momentum electromagnetic simulation in ADS.A ＂double-π＂ circuit model has been built as the inductor model by iteration in *** inductor has been fabricated separately to verify the model. The LNA has been fabricated and *** LNA works well centered at 2.44 *** measured gain S_（21） is variable with high gain at 16.8 dB and low gain at 1 *** NF（noise figure） at high gain mode is 3.6 dB,the input referenced 1 dB compression point（IP1dB） is about -8 dBm and the IIP3 is 2 dBm at low gain *** LNA consumes about 1.2 mA current from 1.8 V power supply.

关键词： low noise amplifier wireless sensor network low power inductor modeling cross-coupling positive feedback

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Adaptive Rake Receiver Joined with Chip Equalization for DS-CDMA UWB Systems over ISI Channels

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Procedia engineering 2012年 29卷 3768-3773页

作者： Feng Wang Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science & Technology Nanjing 210044 China

Since there is much larger channel delay spread, there is serious inter-symbol interference (ISI) when ultrawideband (UWB) wireless communication systems work at high data speed. The serious ISI affects the performance of UWB systems seriously. In this paper, a scheme to suppress ISI is developed for direct sequence spread-code division multiple access (DS-CDMA) UWB systems with a high data speed and an adaptive joint chip equalization Rake (AJCE-Rake) receiver is proposed. The proposed AJCE-Rake receiver spreads the number of traditional Rake receiver taps to collect multi-path component and equalize the inter-chip interference simultaneously. Then the soft output of AJCE-Rake receiver is despreaded with the user's spreading code. Finally, the decision is made to recover the transmitted symbol. The simulation results verify that ISI is suppressed effectively and the system performance is improved evidently.

关键词： UWB ISI Rake receiver MMSE Chip equalization

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A joint chip equalization adaptive rake receiver for DS-CDMA UWB systems over ISI channels

A joint chip equalization adaptive rake receiver for DS-CDMA...

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2012 International Conference on Manufacturing engineering and Process, ICMEP 2012

作者： Wang, Feng Ji, Xuande Jiangsu Technology and Engineering Center of Meteorological Sensor Networks Nanjing University of Information Science and Technology Nanjing China Department of Electrical Engineering and Automation Luoyang Institute of Science and Technology Luoyang China

ISBN: (纸本)9783037854051

There is serious inter-symbol interference (ISI) when ultra-wideband (UWB) wireless communication systems work at high data speed since there is much larger channel delay spread. The serious ISI becomes a major factor that affects the performance of UWB systems. In this paper, suppression ISI is developed for direct sequence spread-code division multiple access (DS-CDMA) UWB systems with a high data speed, and a joint chip equalization adaptive Rake (JCE-Rake) receiver is proposed. The proposed JCE-Rake receiver spreads the number of traditional Rake receiver taps to collect multi-path component and equalize the inter-chip interference simultaneously. Then the soft output of JCE-Rake receiver is despreaded with the user's spreading code. Finally the decision is made to recover the transmitted symbol. The simulation results verify that ISI is suppressed effectively and the system performance is improved evidently. © (2012) Trans Tech Publications.

关键词： Code division multiple access

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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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4th International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC 2012

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

ISBN: (纸本)9780769548104

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. © 2012 IEEE.

关键词： Wireless sensor networks

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UWB autocorrelation receiver based on average differential transmitted reference

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Journal of networks 2012年第11期7卷 1868-1875页

作者： Wang, Feng Ji, Xuande Wang, Yuyan Jiangsu Technology and Engineering Center of Meteorological Sensor Network Nanjing University of Information Science and Technology Nanjing China Department of Electrical Engineering and Automation Luoyang Institute of Science and Technology Luoyang China

There are strong noise components included in the reference signal and the received signal of the ultra- wideband (UWB) differential transmitted reference (DTR) autocorrelation receiver, which impact on the receiver's performance seriously. Therefore this paper proposes a autocorrelation receiver based on average differential transmitted reference (ADTR). This receiver averages the received signals within every frame of the previous symbol period to form the new reference signal. The received signals within each frame of the current symbol interval are also averaged to construct the new received signal, which is correlated with the new reference signal to restore the transmitted symbols. Theoretical analysis and simulation results confirm that BER performance of ADTR autocorrelation receiver is better than the DTR receiver. Compared with DTR receiver, the signal to noise ratio gains of the ADTR receiver are 1.1dB with Ns=3 and 2.1dB with Ns=6 respectively when BER=10-4. © 2012 ACADEMY PUBLISHER.

关键词： Signal to noise ratio

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Bifurcation Analysis of the Colpitts Oscillator Driven by the Chaotic Pulse Signal

Bifurcation Analysis of the Colpitts Oscillator Driven by th...

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International Conference in Electrics, Communication and Automatic Control, ECAC 2011

作者： Li, Chunbiao Hu, Wen Ma, Wei Department of Mechanical and Electrical Engineering Jiangsu Institute of Economic and Trade Technology Nanjing210007 China State Key Laboratory of Millimeter Waves Southeast University Nanjing210096 China Engineering Technology Research and Development Center of Jiangsu Circulation Modernization Sensor Network Jiangsu Institute of Economic and Trade Technology Nanjing210007 China School of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China

ISBN: (纸本)9781441988485

The dynamical behavior of Colpitts oscillator driven by chaotic pulse signal that is based on the bifurcation method is analyzed in this study. We present simulation results of bifurcation in the driven Colpitts system. Colpitts oscillator driven by sinusoidal signal and periodic pulse signal are taken as contrast to demonstrate the nonlinear approach for both the sinusoidal and the chaotic mode of operation. With the appropriate choice of driving signal, the Colpitts circuit can process a robust chaotic state. The bifurcation diagram shows a periodic or chaotic oscillation state determined by the factor of the driving signal. © Springer Science+Business Media, LLC 2012.

关键词： Bifurcation (mathematics)

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Design of a low power charge pump circuit for phase-locked loops

Design of a low power charge pump circuit for phase-locked l...

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2012 4th International High Speed Intelligent Communication Forum, HSIC 2012

作者： Xu, Huili 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)9781467306751

In this paper, the design of a charge pump circuit suitable for lower power PLL-based frequency synthesizer is presented. The charge pump circuit was designed in 0.18m CMOS process. The proposed charge pump circuit improves current matching in a wide output voltage range by applying a wide input ranged operational amplifier. The percentage error of current mismatch for the output range from 0.3V to 1.7V is less than 0.005%. The power consumption of the proposed charge pump circuit is around 0.56mW at a supply voltage of 1.8V. © 2012 IEEE.

关键词： Charge pump circuits

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A 7-bit 26-MS/s SAR ADC in 0.18 m CMOS process for WSN application

A 7-bit 26-MS/s SAR ADC in 0.18 m CMOS process for WSN appli...

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2012 4th International High Speed Intelligent Communication Forum, HSIC 2012

作者： Yang, Ting 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)9781467306751

A 7-bit 26MS/s SAR (successive approximation register) ADC is presented in this paper for the application of ZigBee receiver. Compared to the conventional method, the set-and-down method reduces the average switching energy by around 80%. Dynamic comparator is chosen to diminish the signal-dependent offset caused by the non-fixed input common-mode voltage. A prototype ADC was implemented in a CMOS 0.18-m technology. The ADC consumes 1.66 mW at 26MS/s under a 1.8-V supply. The post-simulation shows that SNDR and SFDR are 43.11dB and 57.49dB, when sampling 3.19921875 MHz sinusoid input signal at 26MHz sampling clock. © 2012 IEEE.

关键词： CMOS integrated circuits

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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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2012 4th International High Speed Intelligent Communication Forum, HSIC 2012

作者： Zhao, Sheng 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)9781467306751

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 0.18m 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. © 2012 IEEE.

关键词： Variable frequency oscillators

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