Negative feedback

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Negative feedback occurs when the output of a system acts to oppose changes to the input of the system, with the result that the changes are attenuated. (Wikipedia.org)






Conferences related to Negative feedback

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2014 IEEE International Symposium on Circuits and Systems (ISCAS)

The IEEE International Symposium on Circuits and Systems (ISCAS) is the flagship conference of the IEEE Circuits and Systems Society and the world

  • 2013 IEEE International Symposium on Circuits and Systems (ISCAS)

    The Symposium will focus on circuits and systems employing nanodevices (both extremely scaled CMOS and non-CMOS devices) and circuit fabrics (mixture of standard CMOS and evolving nano-structure elements) and their implementation cost, switching speed, energy efficiency, and reliability. The ISCAS 2010 will include oral and poster sessions; tutorials given by experts in state-of-the-art topics; and special sessions, with the aim of complementing the regular program with topics of particular interest to the community that cut across and beyond disciplines traditionally represented at ISCAS.

  • 2012 IEEE International Symposium on Circuits and Systems - ISCAS 2012

    2012 International Symposium on Circuits and Systems (ISCAS 2012) aims at providing the world's premier forum of leading researchers in circuits and systems areas from academia and industries, especially focusing on Convergence of BINET (BioInfoNanoEnviro Tech.) which represents IT, NT and ET and leading Human Life Revolutions. Prospective authors are invited to submit papers of their original works emphasizing contributions beyond the present state of the art. We also welcome proposals on special tuto

  • 2011 IEEE International Symposium on Circuits and Systems (ISCAS)

    The IEEE International Symposium on Circuits and Systems (ISCAS) is the world's premier networking forum of leading researchers in the highly active fields of theory, design and implementation of circuits and systems.

  • 2010 IEEE International Symposium on Circuits and Systems - ISCAS 2010

    ISCAS is a unique conference dealing with circuits and systems. It's the yearly "rendez-vous" of leading researchers, coming both from academia and industry, in the highly active fields of theory, design and implementation of circuits and systems. The Symposium will focus on circuits and systems for high quality life and consumer technologies, including mobile communications, advanced multimedia systems, sensor networks and Nano-Bio Circuit Fabrics and Systems.

  • 2009 IEEE International Symposium on Circuits and Systems - ISCAS 2009

    Analog Signal Processing, Biomedical Circuits and Systems, Blind Signal Processing, Cellular Neural Networks and Array Computing, Circuits and Systems for Communications, Computer-Aided Network Design, Digital Signal Processing, Life-Science Systems and Applications, Multimedia Systems and Applications, Nanoelectronics and Gigascale Systems, Neural Systems and Applications, Nonlinear Circuits and Applications, Power Systems and Power Electronic Circuits, Sensory Systems, Visual Signal Processing and Communi


2013 26th International Conference on VLSI Design: concurrently with the 12th International Conference on Embedded Systems

The conference is a forum for researchers and designers to present and discuss various aspects of VLSI design, electronic design automation (EDA), embedded systems, and enabling technologies. It covers the entire spectrum of activities in the two vital areas of very large scale integration (VLSI) and embedded systems, which underpin the semiconductor industry.


2012 IEEE 27th Convention of Electrical & Electronics Engineers in Israel (IEEEI 2012)

All areas of Computers, Electrical and Electronics Engineering.


IECON 2011 - 37th Annual Conference of IEEE Industrial Electronics

industrial applications of electronics, control, robotics, signal processing, computational and artificial intelligence, sensors and actuators, instrumentation electronics, computer networks, internet and multimedia technologies.


2010 International Conference on Electrical and Control Engineering (ICECE)

recent advances, new techniques and applications in the field of Electrical Engineering and Automation Control.


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Periodicals related to Negative feedback

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Image Processing, IEEE Transactions on

Signal-processing aspects of image processing, imaging systems, and image scanning, display, and printing. Includes theory, algorithms, and architectures for image coding, filtering, enhancement, restoration, segmentation, and motion estimation; image formation in tomography, radar, sonar, geophysics, astronomy, microscopy, and crystallography; image scanning, digital half-toning and display, andcolor reproduction.


Knowledge and Data Engineering, IEEE Transactions on

Artificial intelligence techniques, including speech, voice, graphics, images, and documents; knowledge and data engineering tools and techniques; parallel and distributed processing; real-time distributed processing; system architectures, integration, and modeling; database design, modeling, and management; query design, and implementation languages; distributed database control; statistical databases; algorithms for data and knowledge management; performance evaluation of algorithms and systems; data communications aspects; system ...


Microwave Theory and Techniques, IEEE Transactions on

Microwave theory, techniques, and applications as they relate to components, devices, circuits, and systems involving the generation, transmission, and detection of microwaves.


Proceedings of the IEEE

The most highly-cited general interest journal in electrical engineering and computer science, the Proceedings is the best way to stay informed on an exemplary range of topics. This journal also holds the distinction of having the longest useful archival life of any EE or computer related journal in the world! Since 1913, the Proceedings of the IEEE has been the ...


Quantum Electronics, IEEE Journal of

Generation, amplification, modulation, detection, waveguiding, or techniques and effects that can affect the propagation characteristics of coherent electromagnetic radiation having submillimeter and shorter wavelengths


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Xplore Articles related to Negative feedback

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Active damping of ultrasonic transducers for robotic applications

G. Miller; R. Boie; M. Sibilia Proceedings. 1984 IEEE International Conference on Robotics and Automation, 1984

Ultrasonic ranging in air over short distances offers advantages for robotic applications. Such sensing methods can employ transducers small enough to fit into a robot gripper, thereby providing terminal homing capability. Any such short range time-of-flight systems, however, have to solve the problem of rapid receiver recovery after the transmit pulse. In the present case the problem has been solved ...


Millimetre-wave bi-directional amplifiers

J. W. Archer; R. A. Batchelor; O. Sevimli 1997 Topical Symposium on Millimeter Waves. Proceedings (Cat. No.97TH8274), 1997

This paper describes a novel, bi-directional millimetre-wave amplifier, which relies upon the inherent symmetry of devices like FETs or HEMTs. The direction of amplification can be reversed by simply reversing the polarity of the DC bias applied to the active devices. Practical bidirectional amplifier designs have been implemented at 2.5, 42 and 60 GHz


Robust high-speed low input impedance CMOS current comparator

S. Khucharoensin; V. Kasemsuwan Circuits and Systems, 2004. MWSCAS '04. The 2004 47th Midwest Symposium on, 2004

In this paper, a robust high speed low input impedance CMOS current comparator is proposed. The circuit uses modified Wilson current-mirror to perform a current subtraction. Negative feedback is employed to reduce input impedances of the circuit. The diode connected transistors of the same type (NMOS) are used at the output making the circuit immune to the process variation. HSPICE ...


HIMAC: High Throughput MAC Layer Multicasting in Wireless Networks

Ai Chen; Dongwook Lee; Gayathri Chandrasekaran; Prasun Sinha 2006 IEEE International Conference on Mobile Ad Hoc and Sensor Systems, 2006

Efficient, scalable and robust multicasting support from the MAC layer is needed for meeting the demands of multicast based applications over WiFi and mesh networks. However, the IEEE 802.11 protocol has no specific mechanism for multicasting. It implements multicasting using broadcasting at the base transmission rate. We identify two fundamental reasons for performance limitations of this approach: (a) Channel-state indifference: ...


Error and Rate Joint Control for Wireless Video Streaming

Zhongyuan Wang; Ruimin Hu; Youming Fu; Gang Tian 2006 International Conference on Wireless Communications, Networking and Mobile Computing, 2006

In this paper, a precise error-tracking scheme for robust transmission of real-time video streaming over wireless IP network is presented. By utilizing negative acknowledgements from feedback channel, the encoder can precisely calculate and track the propagated errors by examining the backward motion dependency. With this precise tracking, the error-propagation effects can be terminated completely by INTRA refreshing the affected macroblocks. ...


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Educational Resources on Negative feedback

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eLearning

Active damping of ultrasonic transducers for robotic applications

G. Miller; R. Boie; M. Sibilia Proceedings. 1984 IEEE International Conference on Robotics and Automation, 1984

Ultrasonic ranging in air over short distances offers advantages for robotic applications. Such sensing methods can employ transducers small enough to fit into a robot gripper, thereby providing terminal homing capability. Any such short range time-of-flight systems, however, have to solve the problem of rapid receiver recovery after the transmit pulse. In the present case the problem has been solved ...


Millimetre-wave bi-directional amplifiers

J. W. Archer; R. A. Batchelor; O. Sevimli 1997 Topical Symposium on Millimeter Waves. Proceedings (Cat. No.97TH8274), 1997

This paper describes a novel, bi-directional millimetre-wave amplifier, which relies upon the inherent symmetry of devices like FETs or HEMTs. The direction of amplification can be reversed by simply reversing the polarity of the DC bias applied to the active devices. Practical bidirectional amplifier designs have been implemented at 2.5, 42 and 60 GHz


Robust high-speed low input impedance CMOS current comparator

S. Khucharoensin; V. Kasemsuwan Circuits and Systems, 2004. MWSCAS '04. The 2004 47th Midwest Symposium on, 2004

In this paper, a robust high speed low input impedance CMOS current comparator is proposed. The circuit uses modified Wilson current-mirror to perform a current subtraction. Negative feedback is employed to reduce input impedances of the circuit. The diode connected transistors of the same type (NMOS) are used at the output making the circuit immune to the process variation. HSPICE ...


HIMAC: High Throughput MAC Layer Multicasting in Wireless Networks

Ai Chen; Dongwook Lee; Gayathri Chandrasekaran; Prasun Sinha 2006 IEEE International Conference on Mobile Ad Hoc and Sensor Systems, 2006

Efficient, scalable and robust multicasting support from the MAC layer is needed for meeting the demands of multicast based applications over WiFi and mesh networks. However, the IEEE 802.11 protocol has no specific mechanism for multicasting. It implements multicasting using broadcasting at the base transmission rate. We identify two fundamental reasons for performance limitations of this approach: (a) Channel-state indifference: ...


Error and Rate Joint Control for Wireless Video Streaming

Zhongyuan Wang; Ruimin Hu; Youming Fu; Gang Tian 2006 International Conference on Wireless Communications, Networking and Mobile Computing, 2006

In this paper, a precise error-tracking scheme for robust transmission of real-time video streaming over wireless IP network is presented. By utilizing negative acknowledgements from feedback channel, the encoder can precisely calculate and track the propagated errors by examining the backward motion dependency. With this precise tracking, the error-propagation effects can be terminated completely by INTRA refreshing the affected macroblocks. ...


More eLearning Resources

IEEE-USA E-Books

  • Practical Thermal Performance of LEDs

    This chapter discusses thermal performance of light emitting diodes (LEDs). The most immediately noticeable performance change of LEDs with temperature is that their forward voltage drops. This is a die phenomenon, and so varies from manufacturer to manufacturer. Thermal effects on electrical performance of LEDs depend only on the die. There are the effects of temperature on the light beyond the efficacy drop. One more performance consideration is the effect of pulsing current into the LED. Pulse¿¿¿width modulation (PWM) of the current into the LED is a preferred method of dimming. The LED itself has a lifetime that is probably enormous, perhaps hundreds of thousands of hours. This lifetime is set by catastrophic failures, such as bond wires breaking or lightning strikes. In a real circuit, the negative feedback effect is overbalanced by a positive feedback effect.

  • PhaseLock Loops

    This chapter contains sections titled: Introduction PLL Design Background PLL Applications PLL Basics Loop Design Principles Linear Analysis of the PLL Locking a Phase-Lock Loop Loop Types Negative Feedback in a PLL PLL Design Equations Phase Detector Types Design Examples Conclusions Problems References

  • Stochastic Modeling of Intracellular Kinetics

    This chapter contains section titled: 8.1 Chapter Overview, 8.2 Basic Models for Stochastic Kinetics, 8.3 Stochastic Gene Expression, 8.4 Fluctuation- Dissipation Approximations, 8.5 Fluctuations near Critical Points, 8.6 Negative Feedback of Replication Control, 8.7 Noise Induced Transitions, Acknowledgements, Notes

  • Practical Integrated CurrentConveyors

    This part contains sections titled: Introduction The current-mode/voltage-mode dilemma First generation current-conveyors Second generation current-conveyors Input bias-current scaling Local negative feedback A closed-loop current-conveyor A general purpose 'dual' current-conveyor Conclusions This part contains sections titled: References

  • Interconnected Systems and Feedback

    This chapter contains sections titled: Introduction, Elementary System Interconnections; Effects of Loading, Simple Feedback Loops, Examples of the Effects of Negative Feedback, Summary, Exercises for Chapter 5, Problems for Chapter 5

  • Introduction to Modulators: Basic Concepts and Fundamentals

    This chapter is conceived as an introduction to CMOS Sigma-Delta () analog-to- digital converters (ADCs). Their operation principle consists in combining oversampling, quantization error processing, and negative feedback for improving the effective resolution of a coarse quantizer. Before presenting practical topologies for the implementation of modulation, the large variety of the existing realizations is briefly classified according to the type of modulator architecture (single loops or cascades), the circuit techniques employed (discrete time (DT) or continuous-time (CT)), and the nature of the signals being converted (low pass (LP) or band pass (BP)). Starting from the case of DT, LP, single-bit modulators, the implications of these different alternatives are then presented in an incremental way.

  • Circuit Design for Continuous¿¿¿Time Delta¿¿¿Sigma Modulators

    This chapter explores circuit design techniques for the various building blocks of continuous¿¿¿time delta sigma modulators. Integrators can be implemented in many styles, using three popular alternatives that realize an inverting integrator. These diagrams should be interpreted as the single¿¿¿ended equivalent of a fully differential realization. The impressive performance of an operational transconductance amplifier (OTA)¿¿¿RC integrator is achieved through negative feedback. Gm¿¿¿C integrators are useful only when speed is the primary consideration, with linearity being less important. Other non¿¿¿idealities like parasitic capacitances at the input and output, and finite output resistance are neglected. The output conductance of the transistors results in an integrator with finite dc gain, which reduces further with loading. Further, the simplest possible transistor¿¿¿level implementation of a single¿¿¿stage OTA, namely the differential pair, has a limited output swing. The output conductance of the transistors results in an integrator with finite dc gain, which reduces further with loading.

  • No title

    There are five different types of eye movements: saccades, smooth pursuit, vestibular ocular eye movements, optokinetic eye movements, and vergence eye movements. The purpose of this book is focused primarily on mathematical models of the horizontal saccadic eye movement system and the smooth pursuit system, rather than on how visual information is processed. A saccade is a fast eye movement used to acquire a target by placing the image of the target on the fovea. Smooth pursuit is a slow eye movement used to track a target as it moves by keeping the target on the fovea. The vestibular ocular movement is used to keep the eyes on a target during brief head movements. The optokinetic eye movement is a combination of saccadic and slow eye movements that keeps a full-field image stable on the retina during sustained head rotation. Each of these movements is a conjugate eye movement, that is, movements of both eyes together driven by a common neural source. A vergence movement is a non-con ugate eye movement allowing the eyes to track targets as they come closer or farther away. In this book, early models of saccades and smooth pursuit are presented. The smooth pursuit system allows tracking of a slow moving target to maintain its position on the fovea. Models of the smooth pursuit have been developed using systems control theory, all involving a negative feedback control system that includes a time delay, controller and plant in the forward loop, with unity feedback. The oculomotor plant and saccade generator are the basic elements of the saccadic system. The oculomotor plant consists of three muscle pairs and the eyeball. A number of oculomotor plant models are described here beginning with the Westheimer model published in 1954, and up through our 1995 model involving a 4$^{th}$ order oculomotor plant model. The work presented here is not an exhaustive coverage of the field, but focused on the interests of the author. In Part II, a state-of-art model of the saccade s stem is presented, including a neural network that controls the system. Table of Contents: Introduction / Smooth Pursuit Models / Early Models of the Horizontal Saccadic Eye Movement System / Velocity and Acceleration Estimation / 1995 Linear Homeomorphic Saccadic Eye Movement Model

  • Optimization in Physiological Control

    This chapter contains sections titled: Optimization in Systems with Negative Feedback Single-Parameter Optimization: Control of Respiratory Frequency Constrained Optimization: Airflow Pattern Regulation Constrained Optimization: Control of Aortic Flow Pulse Adaptive Control of Physiological Variables This chapter contains sections titled: Bibliography Problems



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