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A CMOS variable gain LNA for UWB receivers

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Journal of Semiconductors 2011年第2期32卷 91-95页

作者：谌斐华李凌云多新中田彤孙晓玮 Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Graduate University of the Chinese Academy of Sciences Semiconductor Manufacturing International Corporation

A CMOS variable gain low noise amplifier （LNA） is presented for 4.24.8 GHz ultra-wideband appli- cation in accordance with Chinese standard. The design method for the wideband input matching is presented and the low noise performance of the LNA is illustrated. A three-bit digital programmable gain control circuit is exploited to achieve variable gain. The design was implemented in 0.13μm RF CMOS process, and the die occupies an area of 0.9 mm2 with ESD pads. Totally the circuit draws 18 mA DC current from 1.2 V DC supply, the LNA exhibits minimum noise figure of 2.3 dB, S（1, 1） less than -9 dB and S（2, 2） less than -10 dB. The maximum and the minimum power gains are 28.5 dB and 16 dB respectively. The tuning step of the gain is about 4 dB with four steps in all. Also the input 1 dB compression point is -10 dBm and input third order intercept point （IIP3） is -2 dBm.

关键词： low noise amplifier ultra-wideband variable gain RF CMOS

A Stroke-Limitation AMD Control System with variable gain and Limited Area for High-Rise Buildings

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Computer Modeling in Engineering & Sciences 2024年第1期138卷 865-884页

作者： Zuo-Hua Li Qing-Gui Wu Jun Teng Chao-Jun Chen School of Civil and Environmental Engineering Harbin Institute of Technology(Shenzhen)Shenzhen518055China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong100872China

Collisions between a moving mass and an anti-collision device increase structural responses and threaten structural *** active mass damper(AMD)with stroke limitations is often used to avoid ***,a strokelimited AMD control system with a fixed limited area shortens the available AMD stroke and leads to significant control *** solve this problem,the design approach with variable gain and limited area(VGLA)is proposed in this ***,the boundary of variable-limited areas is calculated based on the real-time status of the moving *** variable gain(VG)expression at the variable limited area is deduced by considering the saturation of AMD ***,numerical simulations of a stroke-limited AMD control system with VGLA are conducted on a high-rise building *** numerical simulations show that the proposed approach has superior strokelimitation performance compared with a stroke-limited AMD control system with a fixed limited ***,the proposed approach is validated through experiments on a four-story steel frame.

关键词： High-rise buildings active control stroke limitations variable gain variable limited area

The Controller Design of the Water-Aerial Vehicle Based on variable gain PID 32

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The Controller Design of the Water-Aerial Vehicle Based on V...

第32届中国控制与决策会议

作者： Liu huanxiao Meng Zihan Yang Xiaofei Ding Shihong School of Information Engineering Zhenjiang Vocational Technical College School of Electronics and Information Jiangsu University of Science and Technology School of Electrical and Information Engineering Jiangsu University

ISBN: (数字)9781728158556

ISBN: (纸本)9781728158563

Combining the advantages of unmanned aerial vehicle（UAV） and unmanned surface vehicle（USV）,water-aerial vehicles satisfy the requirements of operation in water-air amphibious *** to the medium characteristics of air and water are different,it is difficult to maintain stability of the amphibious vehicle in the operation stage of *** order to solve this problem,the mathematical models of the amphibious vehicle are established in different motion stages,and one stability controller is designed based on the variable gain *** simulation results show that the proposed control method is feasible and meets the requirements of the water-air amphibious vehicle.

关键词： Aerial-water Vehicle Control Law variable gain PID

variable gain Feed-forward Control for Fast Positioning Servo System

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Variable Gain Feed-forward Control for Fast Positioning Serv...

第43届中国控制会议

作者： Changsong Huang Jieying Lu Cheng Wen School of Automation Science and Engineering South China University of Technology School of Mechanical and Automotive Engineering South China University of Technology

The advancement of the motion control has led to increased demands for better position tracking performance to minimize maximum position error and reduce settling time form the the end of position command to controlled plant reaching the command position in servo control *** paper proposes a variable gain feed-forward control method,which has reduced maximum position error and settling time compared to traditional fixed gain feed-forward *** proposed method is divided into two ***,determine velocity feed-forward compensation signal by dividing the motion into three phase:running phase,compensation phase,and positioning ***,use acceleration command and velocity command to fit velocity feed-forward compensation signal in compensation *** proposed method is convenient for application and does not involve the stability of the servo *** results on rotary motor servo system and linear motor servo system show that the proposed method reduces maximum position error over than 87.5% and decreases settling time over than84.9%.

关键词： variable gain Feed-forward control Position tracking Fast settling Servo system

A 1.45GHz LNA with Low Power,Wide variable gain Range and Ultra Low Noise Degradation

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Journal of Semiconductors 2004年第8期25卷 903-907页

作者：林敏王海永李永明陈弘毅清华大学微电子学研究所北京100084

A LNA with a novel variable gain solution is *** with the conventional variable gain solutions of LNA,which have more noise degradations when in low gain mode,this solution gives about 25dB variable gain range in 3dB steps,which would cause ultra low noise figure degradation by 0 3～0 *** addition,extra power consumption is not needed by this solution compared with other solutions.

关键词： LNA variable gain noise degradation low power

A 1.2-V CMOS front-end for LTE direct conversion SAW-less receiver

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Journal of Semiconductors 2012年第3期33卷 76-80页

作者：王日炎黄继伟李正平张伟峰曾隆月 Guangzhou Runxin Information Technology Co.Ltd College of Physics and Information Engineering Fuzhou University Institute of RF-&OE IC Southeast University

A CMOS RF front-end for the long-term evolution（LTE） direct conversion receiver is *** a low noise transconductance amplifier（LNA）,current commutating passive mixer and transimpedance operational amplifier（TIA）,the RF front-end structure enables high-integration,high linearity and simple frequency planning for LTE multi-band *** variable gain is achieved using current-steering transconductance stages.A current commutating passive mixer with 25%duty-cycle LO improves gain,noise and linearity.A direct coupled current-input filter（DCF） is employed to suppress the out-of-band *** in a 0.13-μm CMOS process,the RF front-end achieves a 45 dB conversion voltage gain,2.7 dB NF,-7 dBm IIP3,and ＋60 dBm IIP2 with calibration from 2.3 to 2.7 *** total RF front end with divider draws 40 mA from a single 1.2-V supply.

关键词： RF CMOS front-end passive mixer 25%duty-cycle variable gain quadrature demodulator

A compact and reconfigurable low noise amplifier employing combinational active inductors and composite resistors feedback techniques

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High Technology Letters 2021年第1期27卷 38-42页

作者： Zhang Zheng Zhang Yanhua Yang Ruizhe Shen Pei Ding Chunbao Liu Yaze Huang Xin Chen Jitian Faculty of Information Technology Beijing University of TechnologyBeijing 100124P.R.China

A compact and reconfigurable low noise amplifier(LNA)is proposed by combining an input transistor,composite transistors with Darlington configuration as the amplification and output transistor,T-type structure composite resistors instead of a simplex structure resistor,a shunt inductor feedback realized by a tunable active inductor(AI),a shunt inductor peaking technique realized by another tunable *** division and collaboration among different resistances in the T-type structure composite resistor realize simultaneously input impedance matching,output impedance matching and good noise performance;the shunt feedback and peaking technique using two tunable AIs not only extend frequency bandwidth and improve gain flatness,but also make the gain and frequency band can be tuned simultaneously by the external bias of tunable AIs;the Darlington configuration of composite transistors provides high gain;furthermore,the adoption of the small size AIs instead of large size passive spiral inductor,and the use of composite resistors make the LNA have a small *** LNA is fabricated and verified by GaAs/InGaP hetero-junction bipolar transistor(HBT)*** results show that at the frequency of 7 GHz,the gain S_(21)is maximum and up to 19 dB;the S_(21)can be tuned from 17 dB to 19 dB by tuning external bias of tunable AIs,that is,the tunable amount of S_(21)is 2 dB,and similarly at 8 GHz;the tunable range of 3 dB bandwidth is 1 *** addition,the gain S_(21)flatness is better than 0.4 dB under frequency from 3.1 GHz to 10.6 GHz;the size of the LNA only has 760μm×1260μm(including PADs).Therefore,the proposed strategies in the paper provide a new solution to the design of small size and reconfigurable ultra-wideband(UWB)LNA and can be used further to adjust the variations of gain and bandwidth of radio frequency integrated circuits(RFICs)due to package,parasitic and the variation of fabrication process and temperature.

关键词： variable gain variable bandwidth low noise amplifier(LNA) resistance feedback tunable active inductor(AI)

Research on Active Disturbance Rejection Control of Hydraulic Servo System in Complex Initial States

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Research on Active Disturbance Rejection Control of Hydrauli...

第40届中国控制会议

作者： Fanliang Meng Hao Yan School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Key Laboratory of Vehicle Advanced Manufacturing Measuring and Control TechnologyBeijing Jiaotong UniversityMinistry of Education

In this paper,an improved active disturbance rejection control（ADRC） with variable gain extended state observer（ESO） is designed to control the hydraulic servo system with complex initial states.A method arranging a smooth increase process for the gain of the extended state observer is *** method using Lyapunov function proves that by setting the appropriate gain coefficient of the extended state observer,the asymptotic stability of the extended state observer can be ensured,and the sensitivity of the extended state observer to the initial observation error is *** simulation results show that,compared with the fixed-gain expanded state observer,the variable-gain expanded state observer has a more stable control process and better convergence effect.

关键词： Hydraulic Servo System Complex Initial State ADRC ESO variable gain

Impulse-delay Independent Adaptive Sliding Mode Control for Linear Uncertain impulse-delayed Systems

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Impulse-delay Independent Adaptive Sliding Mode Control for ...

第43届中国控制会议

作者： Shuning Niu Lin Chen Wu-Hua Chen Xiaomei Lu School of Electrical Engineering Guangxi University School of Computer Science and Engineering Sun Yat-sen University School of Mathematics and Information Science Guangxi University

The paper considers the design issue of adaptive sliding mode control(ASMC) for impulse-delayed systems with parameter uncertainty under unknown-upper-bounded matched disturbance. Firstly,based on several auxiliary functions containing the delayed impulse information,the sliding function achieves continuous along the system trajectory. Then,to ensure the sliding motion's existence,an adaptive control law associated with the introduced sliding function is designed. Secondly,a variable gain-based linear control law,independent of impulse-delays,is proposed to robustly stabilize the sliding mode dynamics. Then,a piecewise continuous Lyapunov analysis method is utilized to deduce the sufficient solvability conditions of the control gains,which are given as a set of linear matrix inequalities(LMIs). Finally,by providing a numerical simulation,the proposed ASMC approach is demonstrated to be feasible and efficient.

关键词： Impulsive Systems Sliding Mode Control Adaptive Control variable gain Matched Disturbance Linear Matrix Inequality