A. Volkovskii - Academia.edu (original) (raw)
Papers by A. Volkovskii
IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, 1997
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 ...
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
Radiophysics and Quantum Electronics, 1996
2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512), 2004
World Scientific Series on Nonlinear Science Series B, 1993
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
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
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.
Proceedings of the 5th Experimental Chaos Conference, 2001
Nonlinear Dynamics in Circuits, 1995
We report on experimental studies of synchronization phenomena in a pair of analog electronic neu... more We report on experimental studies of synchronization phenomena in a pair of analog electronic neurons (ENs). The ENs were designed to reproduce the observed membrane voltage oscillations of isolated biological neurons from the stomatogastric ganglion of the California spiny lobster Panulirus interruptus. The ENs are simple analog circuits which integrate four-dimensional differential equations representing fast and slow subcellular mechanisms that produce the characteristic regular/chaotic spiking-bursting behavior of these cells. In this paper we study their dynamical behavior as we couple them in the same configurations as we have done for their counterpart biological neurons. The interconnections we use for these neural oscillators are both direct electrical connections and excitatory and inhibitory chemical connections: each realized by analog circuitry and suggested by biological examples. We provide here quantitative evidence that the ENs and the biological neurons behave similarly when coupled in the same manner. They each display well defined bifurcations in their mutual synchronization and regularization. We report briefly on an experiment on coupled biological neurons and four-dimensional ENs, which provides further ground for testing the validity of our numerical and electronic models of individual neural behavior. Our experiments as a whole present interesting new examples of regularization and synchronization in coupled nonlinear oscillators.
IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, 1997
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 ...
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
Radiophysics and Quantum Electronics, 1996
2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512), 2004
World Scientific Series on Nonlinear Science Series B, 1993
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
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
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.
Proceedings of the 5th Experimental Chaos Conference, 2001
Nonlinear Dynamics in Circuits, 1995
We report on experimental studies of synchronization phenomena in a pair of analog electronic neu... more We report on experimental studies of synchronization phenomena in a pair of analog electronic neurons (ENs). The ENs were designed to reproduce the observed membrane voltage oscillations of isolated biological neurons from the stomatogastric ganglion of the California spiny lobster Panulirus interruptus. The ENs are simple analog circuits which integrate four-dimensional differential equations representing fast and slow subcellular mechanisms that produce the characteristic regular/chaotic spiking-bursting behavior of these cells. In this paper we study their dynamical behavior as we couple them in the same configurations as we have done for their counterpart biological neurons. The interconnections we use for these neural oscillators are both direct electrical connections and excitatory and inhibitory chemical connections: each realized by analog circuitry and suggested by biological examples. We provide here quantitative evidence that the ENs and the biological neurons behave similarly when coupled in the same manner. They each display well defined bifurcations in their mutual synchronization and regularization. We report briefly on an experiment on coupled biological neurons and four-dimensional ENs, which provides further ground for testing the validity of our numerical and electronic models of individual neural behavior. Our experiments as a whole present interesting new examples of regularization and synchronization in coupled nonlinear oscillators.