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A 1.1GHz LC VCO with Automatic Amplitude Control for Tuner Applications
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作者 颜峻 毛威 +5 位作者 马德胜 顾明 许奇明 胡雪青 石寅 代伐 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2006年第7期1189-1195,共7页
This paper presents an LC VCO with auto-amplitude control (AAC), in which pMOS FETs are used,and the varactors are directly connected to ground to widen the linear range of Kvco. The AAC circuitry adds little noise ... This paper presents an LC VCO with auto-amplitude control (AAC), in which pMOS FETs are used,and the varactors are directly connected to ground to widen the linear range of Kvco. The AAC circuitry adds little noise to the VCO but provides it with robust performance over a wide temperature and carrier frequency range.The VCO is fabricated in a chartered 50GHz 0.35μm SiGe BiCMOS process. The measurements show that it has - 127. 27dBc/Hz phase noise at 1MHz offset and a linear gain of 32.4MHz/V between 990MHz and 1.14GHz.The whole circuit draws 6. 6mA current from 5V supply. 展开更多
关键词 TUNER receiver IC LC VCO auto amplitude control
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Linear synchronization and circuit implementation of chaotic system with complete amplitude control 被引量:2
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作者 李春彪 Wesley Joo-Chen Thio +2 位作者 Julien Clinton Sprott 张若洵 陆天爱 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第12期124-133,共10页
Although chaotic signals are considered to have great potential applications in radar and communication engineering, their broadband spectrum makes it difficult to design an applicable amplifier or an attenuator for a... Although chaotic signals are considered to have great potential applications in radar and communication engineering, their broadband spectrum makes it difficult to design an applicable amplifier or an attenuator for amplitude conditioning. Moreover, the transformation between a unipolar signal and a bipolar signal is often required. In this paper, a more intelligent hardware implementation based on field programmable analog array (FPAA) is constructed for chaotic systems with complete amplitude control. Firstly, two chaotic systems with complete amplitude control are introduced, one of which has the property of offset boosting with total amplitude control, while the other has offset boosting and a parameter for partial control. Both cases can achieve complete amplitude control including amplitude rescaling and offset boosting. Secondly, linear synchronization is established based on the special structure of chaotic system. Finally, experimental circuits are constructed on an FPAA where the predicted amplitude control is realized through only two independent configurable analog module (CAM) gain values. 展开更多
关键词 complete amplitude control amplitude rescaling offset boosting linear synchronization
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VARIABLE STRUCTURE CONTROL APPLIED IN ELECTRO-HYDRAULIC SERVO SYSTEM WITH ANN 被引量:6
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作者 YAO Jianjun WANG Xiancheng +1 位作者 WU Zhenshun HAN Junwei 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2006年第1期32-36,共5页
The variable structure control (VSC) theory is applied to the electro-hydraulic servo system here. The VSC control law is achieved using Lyapunov method and pole placement. To eliminate the chattering phenomena, a s... The variable structure control (VSC) theory is applied to the electro-hydraulic servo system here. The VSC control law is achieved using Lyapunov method and pole placement. To eliminate the chattering phenomena, a saturation function is adopted. The proposed VSC approach is fairly robust to load disturbance and system parameter variation. Since the distortion. including phase lag and amplitude attenuation occurs in the system sinusoid response, the amplitude and phase control (APC) algorithm, based on Adaline neural network and using LMS algorithm, is developed for distortion cancellation. The APC controller is simple and can on-line adjust, thus it gives accurate tracking. 展开更多
关键词 Variable structure control (VSC) Adaline neural network Pole placement LMS algorithm amplitude and phase control (APC)
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Variable optical attenuators with ability to independently control two orthogonal linearly polarized light amplitudes 被引量:1
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作者 Chongjia Huang Erwin H. W. Chan 《Chinese Optics Letters》 SCIE EI CAS CSCD 2018年第4期90-93,共4页
New techniques for controlling the amplitudes of two orthogonal linearly polarized light are presented. One is based on adjusting the DC voltage into a Mach–Zehnder modulator(MZM) to alter the amplitude of the ligh... New techniques for controlling the amplitudes of two orthogonal linearly polarized light are presented. One is based on adjusting the DC voltage into a Mach–Zehnder modulator(MZM) to alter the amplitude of the light traveling on the slow axis of a fiber into the modulator with little changes in the fast-axis light amplitude.Another is based on adjusting the input DC voltages of a dual-polarization MZM operating in the reverse direction, which enables independent control of the two input orthogonal linearly polarized light amplitudes.Experimental results demonstrate that more than 30 dB difference in slow-and fast-axis light power can be obtained by controlling an MZM input DC voltage, and over 24 dB independent power adjustment for light traveling on the slow and fast axes into a dual-polarization MZM. 展开更多
关键词 MZM DC Variable optical attenuators with ability to independently control two orthogonal linearly polarized light amplitudes
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A memristive map with coexisting chaos and hyperchaos
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作者 Sixiao Kong Chunbiao Li +2 位作者 Shaobo He Serdar C¸ic¸ek Qiang Lai 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第11期286-296,共11页
By introducing a discrete memristor and periodic sinusoidal functions,a two-dimensional map with coexisting chaos and hyperchaos is constructed.Various coexisting chaotic and hyperchaotic attractors under different Ly... By introducing a discrete memristor and periodic sinusoidal functions,a two-dimensional map with coexisting chaos and hyperchaos is constructed.Various coexisting chaotic and hyperchaotic attractors under different Lyapunov exponents are firstly found in this discrete map,along with which other regimes of coexistence such as coexisting chaos,quasiperiodic oscillation,and discrete periodic points are also captured.The hyperchaotic attractors can be flexibly controlled to be unipolar or bipolar by newly embedded constants meanwhile the amplitude can also be controlled in combination with those coexisting attractors.Based on the nonlinear auto-regressive model with exogenous inputs(NARX)for neural network,the dynamics of the memristive map is well predicted,which provides a potential passage in artificial intelligencebased applications. 展开更多
关键词 MEMRISTOR HYPERCHAOS coexisting attractors amplitude control neural network
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High-fidelity resonant tunneling passage in three-waveguide system
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作者 Rui-Qiong Ma Jian Shi +4 位作者 Lin Liu Meng Liang Zuo-Liang Duan Wei Gao Jun Dong 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第2期320-328,共9页
An N-stage three-waveguide system is proposed to improve the robustness and the fidelity of the resonant tunneling passage.The analytic solutions to the tunneling dynamics at the output are derived.When the number of ... An N-stage three-waveguide system is proposed to improve the robustness and the fidelity of the resonant tunneling passage.The analytic solutions to the tunneling dynamics at the output are derived.When the number of subsystems increases,tunneling efficiency approaches to 100%in a large range and resonant tunneling is robust against variations in the phase mismatch and peak tunneling rate. 展开更多
关键词 amplitude control resonant tunneling passage ROBUSTNESS
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The improved PAC method for a three-phase PWM grid-connected inverter
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作者 李杰 马祎炜 +2 位作者 陈国呈 王得利 俞俊杰 《Journal of Shanghai University(English Edition)》 CAS 2008年第6期560-564,共5页
In this paper, a vector regulating principle of the phase and amplitude control PAC method for three-phase grid-connected inverters is presented.To solve the problem of heavy inrush current and slow dynamic response w... In this paper, a vector regulating principle of the phase and amplitude control PAC method for three-phase grid-connected inverters is presented.To solve the problem of heavy inrush current and slow dynamic response when system starts up, the starting voltage prediction control and the current feed-forward control are proposed and used, which improve the dynamic performance of the system in the PAC.The experimental results carried out on a three-phase grid-connected inverter proved the validity of the proposed method. 展开更多
关键词 three-phase pulse width modulation (PWM) grid-connected inverter phase and amplitude control (PAC) starting voltage prediction control current feed-forward control
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Optical bistability and multistability via amplitude and phase control in a Duplicated two-level system
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作者 金璐玲 冯忠耀 《Chinese Optics Letters》 SCIE EI CAS CSCD 2013年第5期1-4,共4页
We investigate the optical bistabiiity (OB) in a duplicated two-level system contained in a ring cavity. The atoms are driven by two orthogonally polarized fields with a relative phase. The OB behavior of such a sys... We investigate the optical bistabiiity (OB) in a duplicated two-level system contained in a ring cavity. The atoms are driven by two orthogonally polarized fields with a relative phase. The OB behavior of such a system can be controlled by the amplitude and the relative phase of the coupling field, and it is possible to switch between bistabilitv and multistability by adjusting the relative phase. 展开更多
关键词 Optical bistability and multistability via amplitude and phase control in a Duplicated two-level system OB
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BEAM BROADENING SYNTHESIS FOR SAR ANTENNA ARRAY BASED ON PROJECTION MATRIX ALGORITHM
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作者 Jiao Junjun Sun Huifeng 《Journal of Electronics(China)》 2014年第5期433-440,共8页
A new beam broadening synthesis technique for Synthetic Aperture Radar(SAR) antenna array, namely Projection Matrix Algorithm(PMA) is presented. The theory of PMA is introduced firstly, and then the iterative renewed ... A new beam broadening synthesis technique for Synthetic Aperture Radar(SAR) antenna array, namely Projection Matrix Algorithm(PMA) is presented. The theory of PMA is introduced firstly, and then the iterative renewed manner is improved to resolve the unbalance problem under amplitude and phase control. In order to validate the algorithm correct and effective, an actual engineering application example is investigated. The beam synthesis results of 1.0~4.5 times broadening under the phase only control and the amplitude and phase control using improved PMA are given. The results show that the beam directivity, the beam broadening, and the side-lobe level requirements were met. It is demonstrated that the improved PMA was effective and feasible for SAR application. 展开更多
关键词 Synthetic Aperture Radar(SAR) antenna array Beam broadening synthesis Projection Matrix Algorithm(PMA) Phase only control amplitude and phase control
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