A. Volkovskii - Profile on Academia.edu (original) (raw)
Papers by A. Volkovskii
An electronic circuit intended to simulate the nonlinear dynamics of a simplified 3-cell model of... more An electronic circuit intended to simulate the nonlinear dynamics of a simplified 3-cell model of the pyloric central pattern generator in California spiny lobster stomato gastric ganglion is presented. The model employs the synaptic phase locked loop (SPLL) concept where the frequency of oscillations of a postsynaptic cell is mainly controlled by the synaptic current which depends on the phase shift between the oscillations. The theoretical study showed that the system has a stable steady state with correct phase shifts between the oscillations and that this regime is stable when the frequency of the pacemaker cell is varied over a wide range. The main bifurcations in the system were studied analytically, in computer simulations, and in experiments with the electronic circuit. The experimental measurements are in good agreement with the expectations of the theoretical model.
Journal of Physics: Conference Series, 2005
An electronic circuit intended to simulate the nonlinear dynamics of a simplified 3-cell model of... more An electronic circuit intended to simulate the nonlinear dynamics of a simplified 3-cell model of the pyloric central pattern generator in California spiny lobster stomato gastric ganglion is presented. The model employs the synaptic phase locked loop (SPLL) concept where the frequency of oscillations of a postsynaptic cell is mainly controlled by the synaptic current which depends on the phase shift between the oscillations. The theoretical study showed that the system has a stable steady state with correct phase shifts between the oscillations and that this regime is stable when the frequency of the pacemaker cell is varied over a wide range. The main bifurcations in the system were studied analytically, in computer simulations, and in experiments with the electronic circuit. The experimental measurements are in good agreement with the expectations of the theoretical model.
We are developing robot controllers based on biomimetic design principles. The goal is to realise... more We are developing robot controllers based on biomimetic design principles. The goal is to realise the adaptive capabilities of the animal models in natural environments. We report feasibility studies of a hybrid architecture that instantiates a command and coordinating level with computed discrete-time map-based (DTM) neuronal networks and the central pattern generators with analogue VLSI (Very Large Scale Integration) electronic neuron (aVLSI) networks. DTM networks are realised using neurons based on a 1-D or 2-D Map with two additional parameters that define silent, spiking and bursting regimes. Electronic neurons (ENs) based on Hindmarsh-Rose (HR) dynamics can be instantiated in analogue VLSI and exhibit similar behaviour to those based on discrete components. We have constructed locomotor central pattern generators (CPGs) with aVLSI networks that can be modulated to select different behaviours on the basis of selective command input. The two technologies can be fused by interfacing the signals from the DTM circuits directly to the aVLSI CPGs. Using DTMs, we have been able to simulate complex sensory fusion for rheotaxic behaviour based on both hydrodynamic and optical flow senses. We will illustrate aspects of controllers for ambulatory biomimetic robots. These studies indicate that it is feasible to fabricate an electronic nervous system controller integrating both aVLSI CPGs and layered DTM exteroceptive reflexes.
IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, 1997
Synchronization of chaotic systems by control using a phase feedback loop is investigated. Sugges... more Synchronization of chaotic systems by control using a phase feedback loop is investigated. Suggested algorithm of synchronization can be used both for discrete time and for continuous time systems. Due to similarity to the usual phase lock loop, this method allows to generalize the majority of applications of phase lock-in for chaotic systems.
Synchronization and communication using chaotic frequency modulation
International Journal of Circuit Theory and Applications, 1999
Abstract In this paper we propose a chaotic frequency modulation (CFM) technique for spread spect... more Abstract In this paper we propose a chaotic frequency modulation (CFM) technique for spread spectrum communications. Existence and stability of the synchronous mode is demonstrated analytically and numerically. Unlike synchronization of two conventional ...
Sensory Coding with Dynamically Competitive Networks
Studies of insect olfactory processing indicate that odors are represented by rich spatio-tempora... more Studies of insect olfactory processing indicate that odors are represented by rich spatio-temporal patterns of neural activity. These patterns are very difficult to predict a priori, yet they are stimulus specific and reliable upon repeated stimulation with the same input. We formulate here a theoretical framework in which we can interpret these experimental results. We propose a paradigm of ``dynamic
Chaos Solitons Fractals 4
Radiophysics and Quantum Electronics, 1996
Experimental results on the synchronization of chaotic oscillations and data transmission in the ... more Experimental results on the synchronization of chaotic oscillations and data transmission in the system "oscillator-response subsystem" are presented.
2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512), 2004
We discuss a VLSI electronic neuron circuit that implements Hindmarsh and Rose neuron model. Magn... more We discuss a VLSI electronic neuron circuit that implements Hindmarsh and Rose neuron model. Magnitude and time scaling techniques are employed for 2V power supply operation. A subthreshold operation technique and a single MOS resistor are used to minimize area and power consumption. Output bursts of the electronic neuron can be modulated dynamically by varying the input voltage level. The circuit is designed using 0.25 m CMOS standard process, and the total power dissipation is 163.4 watt.
Experimental Analysis of 1-D Maps from Chua's Circuit
World Scientific Series on Nonlinear Science Series B, 1993
Biomimetic Central Pattern Generators for Robotics and Prosthetics
2004 IEEE International Conference on Robotics and Biomimetics, 2004
Abstract Invertebrate central pattern generators (CPGs) can serve as the basis for building biomi... more Abstract Invertebrate central pattern generators (CPGs) can serve as the basis for building biomimetic controllers based on real biological principles. Here we describe a CPG made of electronic neurons and synapses for robotic applications and for possible use in a clinical neuroprosthetic device
Multi-Channel Front-End Readout IC for Position Sensitive Solid-State Detectors
2006 IEEE Nuclear Science Symposium Conference Record, 2006
A multi-channel front-end readout IC is developed for position sensitive solid-state detectors. I... more A multi-channel front-end readout IC is developed for position sensitive solid-state detectors. It is called RENA-3. It has 36 low noise channels. Each channel has externally selectable input polarity. The channel inputs are optimized for 2 or 9 pF detector capacitance, which is externally selectable. It also has selectable dual energy range, 56K and 338K electrons (250 keV and 1.5
New high resolution detectors for SPECT
Neurotechnology: synthetic neuroscience for robotics
Use of one-dimensional mapping for an experimental study of the stochastic dynamics of an oscillator
Hard X-Ray and Gamma-Ray Detector Physics and Penetrating Radiation Systems VIII, 2006
We have developed high energy and high spatial resolution 1D and 2D solid state imaging detectors... more We have developed high energy and high spatial resolution 1D and 2D solid state imaging detectors and their custom integrated circuits (ICs). Readout ICs are now regarded to be an integral part of position-sensitive semiconductor detectors, especially for Si and CdZnTe for x-ray and gamma-ray imaging. These detectors have a 1D or 2D structure. The 1D structure types are mostly
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics X, 2008
ABSTRACT We have developed high energy and high spatial resolution two-dimensional (2D) solid-sta... more ABSTRACT We have developed high energy and high spatial resolution two-dimensional (2D) solid-state imaging pixel detectors and their custom integrated circuits (ICs). Solid-state pixel detectors and their readout ICs are now regarded to be an integral part of position-sensitive semiconductor detectors such as Si, CdTe and CdZnTe for x-ray and gamma-ray imaging. These detectors have a 2D structure. We have also developed one-dimensional (1D) detectors, which are mostly used for scanning type imaging. The new 2D pixel detectors we have developed can be used for both scanning and staring mode imaging applications. Because the requirements of various detector applications tend to be diverse, a custom IC is typically designed for a specific detector array. This often lengthens the time and raises the cost of system development. To help close the readout technology gap and facilitate advances in this field, we have been formulating and implementing strategies for instrumenting different detectors of a given application category with highly versatile ICs that meet a range of requirements. The solid-state pixel detectors that have been developed within this effort are presented below.
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics X, 2008
The RENA-3 (R Readout E eadout Electronics for N lectronics Nuclear A uclear Applications) is a m... more The RENA-3 (R Readout E eadout Electronics for N lectronics Nuclear A uclear Applications) is a multi-channel mixed-signal integrated circuit (IC) developed for the readout of position-sensitive solid-state detectors with excellent energy resolution. We will present results of experiments characterizing its performance as used with a variety of spectroscopy-grade detectors currently available in the industry, notably CZT pixel arrays as well as other detector configurations. The merits of specific RENA-3 design features vis-à-vis different detector applications will also be discussed.
Chaotic Pulse Trains in Digital Communications
Proceedings of the 5th Experimental Chaos Conference, 2001
An electronic circuit intended to simulate the nonlinear dynamics of a simplified 3-cell model of... more An electronic circuit intended to simulate the nonlinear dynamics of a simplified 3-cell model of the pyloric central pattern generator in California spiny lobster stomato gastric ganglion is presented. The model employs the synaptic phase locked loop (SPLL) concept where the frequency of oscillations of a postsynaptic cell is mainly controlled by the synaptic current which depends on the phase shift between the oscillations. The theoretical study showed that the system has a stable steady state with correct phase shifts between the oscillations and that this regime is stable when the frequency of the pacemaker cell is varied over a wide range. The main bifurcations in the system were studied analytically, in computer simulations, and in experiments with the electronic circuit. The experimental measurements are in good agreement with the expectations of the theoretical model.
Journal of Physics: Conference Series, 2005
An electronic circuit intended to simulate the nonlinear dynamics of a simplified 3-cell model of... more An electronic circuit intended to simulate the nonlinear dynamics of a simplified 3-cell model of the pyloric central pattern generator in California spiny lobster stomato gastric ganglion is presented. The model employs the synaptic phase locked loop (SPLL) concept where the frequency of oscillations of a postsynaptic cell is mainly controlled by the synaptic current which depends on the phase shift between the oscillations. The theoretical study showed that the system has a stable steady state with correct phase shifts between the oscillations and that this regime is stable when the frequency of the pacemaker cell is varied over a wide range. The main bifurcations in the system were studied analytically, in computer simulations, and in experiments with the electronic circuit. The experimental measurements are in good agreement with the expectations of the theoretical model.
We are developing robot controllers based on biomimetic design principles. The goal is to realise... more We are developing robot controllers based on biomimetic design principles. The goal is to realise the adaptive capabilities of the animal models in natural environments. We report feasibility studies of a hybrid architecture that instantiates a command and coordinating level with computed discrete-time map-based (DTM) neuronal networks and the central pattern generators with analogue VLSI (Very Large Scale Integration) electronic neuron (aVLSI) networks. DTM networks are realised using neurons based on a 1-D or 2-D Map with two additional parameters that define silent, spiking and bursting regimes. Electronic neurons (ENs) based on Hindmarsh-Rose (HR) dynamics can be instantiated in analogue VLSI and exhibit similar behaviour to those based on discrete components. We have constructed locomotor central pattern generators (CPGs) with aVLSI networks that can be modulated to select different behaviours on the basis of selective command input. The two technologies can be fused by interfacing the signals from the DTM circuits directly to the aVLSI CPGs. Using DTMs, we have been able to simulate complex sensory fusion for rheotaxic behaviour based on both hydrodynamic and optical flow senses. We will illustrate aspects of controllers for ambulatory biomimetic robots. These studies indicate that it is feasible to fabricate an electronic nervous system controller integrating both aVLSI CPGs and layered DTM exteroceptive reflexes.
IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, 1997
Synchronization of chaotic systems by control using a phase feedback loop is investigated. Sugges... more Synchronization of chaotic systems by control using a phase feedback loop is investigated. Suggested algorithm of synchronization can be used both for discrete time and for continuous time systems. Due to similarity to the usual phase lock loop, this method allows to generalize the majority of applications of phase lock-in for chaotic systems.
Synchronization and communication using chaotic frequency modulation
International Journal of Circuit Theory and Applications, 1999
Abstract In this paper we propose a chaotic frequency modulation (CFM) technique for spread spect... more Abstract In this paper we propose a chaotic frequency modulation (CFM) technique for spread spectrum communications. Existence and stability of the synchronous mode is demonstrated analytically and numerically. Unlike synchronization of two conventional ...
Sensory Coding with Dynamically Competitive Networks
Studies of insect olfactory processing indicate that odors are represented by rich spatio-tempora... more Studies of insect olfactory processing indicate that odors are represented by rich spatio-temporal patterns of neural activity. These patterns are very difficult to predict a priori, yet they are stimulus specific and reliable upon repeated stimulation with the same input. We formulate here a theoretical framework in which we can interpret these experimental results. We propose a paradigm of ``dynamic
Chaos Solitons Fractals 4
Radiophysics and Quantum Electronics, 1996
Experimental results on the synchronization of chaotic oscillations and data transmission in the ... more Experimental results on the synchronization of chaotic oscillations and data transmission in the system "oscillator-response subsystem" are presented.
2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512), 2004
We discuss a VLSI electronic neuron circuit that implements Hindmarsh and Rose neuron model. Magn... more We discuss a VLSI electronic neuron circuit that implements Hindmarsh and Rose neuron model. Magnitude and time scaling techniques are employed for 2V power supply operation. A subthreshold operation technique and a single MOS resistor are used to minimize area and power consumption. Output bursts of the electronic neuron can be modulated dynamically by varying the input voltage level. The circuit is designed using 0.25 m CMOS standard process, and the total power dissipation is 163.4 watt.
Experimental Analysis of 1-D Maps from Chua's Circuit
World Scientific Series on Nonlinear Science Series B, 1993
Biomimetic Central Pattern Generators for Robotics and Prosthetics
2004 IEEE International Conference on Robotics and Biomimetics, 2004
Abstract Invertebrate central pattern generators (CPGs) can serve as the basis for building biomi... more Abstract Invertebrate central pattern generators (CPGs) can serve as the basis for building biomimetic controllers based on real biological principles. Here we describe a CPG made of electronic neurons and synapses for robotic applications and for possible use in a clinical neuroprosthetic device
Multi-Channel Front-End Readout IC for Position Sensitive Solid-State Detectors
2006 IEEE Nuclear Science Symposium Conference Record, 2006
A multi-channel front-end readout IC is developed for position sensitive solid-state detectors. I... more A multi-channel front-end readout IC is developed for position sensitive solid-state detectors. It is called RENA-3. It has 36 low noise channels. Each channel has externally selectable input polarity. The channel inputs are optimized for 2 or 9 pF detector capacitance, which is externally selectable. It also has selectable dual energy range, 56K and 338K electrons (250 keV and 1.5
New high resolution detectors for SPECT
Neurotechnology: synthetic neuroscience for robotics
Use of one-dimensional mapping for an experimental study of the stochastic dynamics of an oscillator
Hard X-Ray and Gamma-Ray Detector Physics and Penetrating Radiation Systems VIII, 2006
We have developed high energy and high spatial resolution 1D and 2D solid state imaging detectors... more We have developed high energy and high spatial resolution 1D and 2D solid state imaging detectors and their custom integrated circuits (ICs). Readout ICs are now regarded to be an integral part of position-sensitive semiconductor detectors, especially for Si and CdZnTe for x-ray and gamma-ray imaging. These detectors have a 1D or 2D structure. The 1D structure types are mostly
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics X, 2008
ABSTRACT We have developed high energy and high spatial resolution two-dimensional (2D) solid-sta... more ABSTRACT We have developed high energy and high spatial resolution two-dimensional (2D) solid-state imaging pixel detectors and their custom integrated circuits (ICs). Solid-state pixel detectors and their readout ICs are now regarded to be an integral part of position-sensitive semiconductor detectors such as Si, CdTe and CdZnTe for x-ray and gamma-ray imaging. These detectors have a 2D structure. We have also developed one-dimensional (1D) detectors, which are mostly used for scanning type imaging. The new 2D pixel detectors we have developed can be used for both scanning and staring mode imaging applications. Because the requirements of various detector applications tend to be diverse, a custom IC is typically designed for a specific detector array. This often lengthens the time and raises the cost of system development. To help close the readout technology gap and facilitate advances in this field, we have been formulating and implementing strategies for instrumenting different detectors of a given application category with highly versatile ICs that meet a range of requirements. The solid-state pixel detectors that have been developed within this effort are presented below.
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics X, 2008
The RENA-3 (R Readout E eadout Electronics for N lectronics Nuclear A uclear Applications) is a m... more The RENA-3 (R Readout E eadout Electronics for N lectronics Nuclear A uclear Applications) is a multi-channel mixed-signal integrated circuit (IC) developed for the readout of position-sensitive solid-state detectors with excellent energy resolution. We will present results of experiments characterizing its performance as used with a variety of spectroscopy-grade detectors currently available in the industry, notably CZT pixel arrays as well as other detector configurations. The merits of specific RENA-3 design features vis-à-vis different detector applications will also be discussed.
Chaotic Pulse Trains in Digital Communications
Proceedings of the 5th Experimental Chaos Conference, 2001