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International Conference on Mixed Design of Integrated Circuits and Systems, MIXDES 2006

作者： Gryboś, P. Idzik, M. Maj, P. Świentek, K. AGH University of Science and Technology Poland Faculty of Physics and Applied Computer Science AGH UST Al. Mickiewicza 30 30-059 Krakow Poland Faculty of Electrical Engineering Automatics Computer Science and Electronics AGH UST Al. Mickiewicza 30 30-059 Krakow Poland

ISBN: (纸本)8392263219

A multichannel ASIC for digital X-ray imaging requires one or more discriminators in each recording channel. The critical parameters of these discriminators are low power consumption and low offset spreads from channel to channel. In the readout electronics dedicated to work with high rates of input pulses the charge sensitive amplifier, filter stages and discriminators are often DC coupled. Such approach generates additional channel to channel spread of DC level at discriminators inputs. In this paper we present the structure of discriminators pair, which allows to select pulses according to their amplitudes and can work effectively in multichannel fast readout ASIC due to additional correction circuits implemented in each channel. We present the architecture of the discriminators, the results of Monte Carlo simulations of input offsets spreads and the measurement results of such structures which were implemented in 64-channel ASIC fabricated in 0.35 μm CMOS technology. Copyright © 2006 by Department of Microelectronics & computer science, Technical University of Lodz.

关键词： Application specific integrated circuits

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Energy dissipation of electron solitons in a quantum well

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Physical Review B 2006年第15期73卷 155318-155318页

作者： S. Bednarek B. Szafran Faculty of Physics and Applied Computer Science AGH University of Science and Technology PL-30059 Kraków Poland

A linear response theory is provided for the dynamic interaction effects of an electron soliton confined in semiconductor quantum well with a conducting surface or a two-dimensional electron gas. It is shown that the soliton-electron-gas effective potential contains a dissipative component resisting against changes of the soliton charge density. Due to the energy dissipation moving solitons are stopped and the nonstationary excitations of the wave packet relax to the standing ground state.

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Design, Functionality And Testability Of A Multichannel Asic For Digital X-ray Imaging

Design, Functionality And Testability Of A Multichannel Asic...

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International Conference on Mixed Design of Integrated Circuits and Systems (MIXDES)

作者： P. Grybos M. Idzik P. Maj K. Swientek Faculty of Physics and Applied Computer Science AGH University of Science and Technology Krakow Poland

This paper presents the design and results of first measurements of a fast binary readout architecture ASIC aimed for digital X-ray imaging. The ASIC called DEDIX includes 64 readout channels, a number of DACs for different bias and threshold settings, voltage reference, temperature sensor circuit, calibration circuit, I/O circuit and a control logic circuit. Each readout channel consists of charge amplifier, PZC circuit, shaper, two discriminators and two 20-bit counters. The DEDIX is supposed to work in relatively complex systems featuring several hundred detector channels. For this reason particular attention was paid to general system solutions and the circuit testability. This paper is essentially dedicated to these aspects of DEDIX operation. The circuit was implemented in a 3.3 V 0.35 mum CMOS technology. First tests confirm full functionality of the ASIC

关键词： X-ray imaging Application specific integrated circuits Circuit testing CMOS technology Threshold voltage Temperature sensors Calibration Temperature control Voltage control Logic circuits

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Design Of A Multichannel Asic For Large Scale Spatio-temporal Distributed Stimulation Of Neural Tissue

Design Of A Multichannel Asic For Large Scale Spatio-tempora...

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International Conference on Mixed Design of Integrated Circuits and Systems (MIXDES)

作者： P. Hottowy W. Dabrowski A. Skoczen P. Wiacek Faculty of Physics and Applied Computer Science AGH University of Science And Technology Krakow Poland

We present an ASIC designed for electrical stimulation of neural tissue using multielectrode arrays. The ASIC is foreseen for applications in systems requiring simultaneous stimulation and recording of signals from various types of neural tissue, both in-vitro and in-vivo. The developed STIM64 ASIC includes 64 independent stimulation channels, which are capable to generate arbitrarily defined bipolar current or voltage waveforms, controlled in real time with time resolution of 50 mus and amplitude resolution of 7 bits. The amplitude range of output signal can be scaled over a very wide range, what ensures compatibility with various electrode arrays of different size and geometry. Each channel is equipped with a real-time controlled stimulation artifact suppressor, which reduces the 'dead time' between the stimulation pulse and system being ready for signal recording

关键词： Large-scale systems Application specific integrated circuits Signal resolution Electrical stimulation In vitro Voltage control Electrodes Geometry Real time systems Control systems

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Residual conductivity and Seebeck coefficient calculations in TiCo1-xCuxSb alloys

Residual conductivity and Seebeck coefficient calculations i...

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International Conference on Thermoelectrics (ICT)

作者： T. Stopa J. Tobola S. Kaprzyk Faculty of Physics and Applied Computer Science AGH University of Science and Technology Krakow Poland

We report results of conductivity and Seebeck coefficient calculations for TiCo 1-x Cu x Sb alloys, as well as their comparison with experimental data. TiCoSb crystallizes in a half-Heusler crystal structure. As revealed from experimental measurements by Horyn et al., this type of structure does not change with Cu doping until x = 0.5. Moreover, lattice constant changes also very slightly and not-monotonically for 0 < x < 0.5, varying less then 0.001 nm. Therefore, we decided to use fixed lattice constant a = 0.58819 nm for all Cu concentrations. In TiCo 1-x Cu x Sb a semiconductor-metal phase transition is observed upon even very small Cu doping. This is connected with the fact, that Fermi level in TiCoSb is located at the top of valence band. When the number of electrons in the system grows, Fermi energy crosses energy gap (which is about 1 eV) and enters conduction band. Also Seebeck coefficient increases rapidly with x from about -350 muV/K in TiCoSb to almost zero for x = 0.5, but it doesn't change the sign. All calculations were performed within Korringa-Kohn-Rostoker (KKR) method [Bansil et al., 1990 and 1999] with coherent potential approximation (CPA) [Soven, 1967] and [Kaprzyk and Bansil, 1990]

关键词： Conductivity Electrons Crystallization Semiconductor device doping Lattices High performance computing physics computer science Dispersion Linear discriminant analysis

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Charged black holes coupled to non-linear electrodynamics in scalar-tensor theories of gravity with massive scalar field

Charged black holes coupled to non-linear electrodynamics in...

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4th Summer School in Modern Mathematical physics, MPHYS 2006

作者： Stefanov, Ivan Zh. Yazadjiev, Stoytcho S. Todorov, Michail D. Dept. of Theoretical Physics Faculty of Physics University of Sofia St. Kliment Ohridski 5 James Bourchier Blvd. 1164 Sofia Bulgaria Faculty of Applied Mathematics and Computer Science Technical University of Sofia 8 Kliment Ohridski Blvd. 1000 Sofia Bulgaria

The no-scalar-hair theorems do not apply in the case when non-linear electrodynamics is included in the theory. In the current work, some preliminary numerical results describing charged black holes coupled to Born-In... 详细信息

关键词： Electrodynamics

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Search for Sc3XB (X=In,Tl,Ga,Al) perovskites superconductors and proximity of weak ferromagnetism

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Physical Review B 2006年第13期73卷 134522-134522页

作者： B. Wiendlocha J. Tobola S. Kaprzyk Faculty of Physics and Applied Computer Science AGH University of Science and Technology Aleja. Mickiewicza 30 30-059 Krakow Poland

A possibility for an additional family of intermetallic perovskite superconductors Sc3XB, with X=Tl, In, Ga, and Al, is presented as a result of Korringa-Kohn-Rostoker (KKR) electronic structure and pseudopotential phonon calculations. The large values of computed McMillan-Hopfield parameters on scandium suggest the appearance of superconductivity in Sc3XB compounds. On the other hand, the possibility of weak itinerant ferromagnetic behavior of Sc3X systems is indicated by the small magnetic moment on Sc atoms in the two cases of X=Tl and In. In addition, the electronic structure and resulting superconducting parameters for the realistic case of boron-deficient systems Sc3XBx are computed, using KKR method with the coherent potential approximation, by replacing boron atom with a vacancy. The comparison of the calculated McMillan-Hopfield parameters of the Sc3XB series with corresponding values in related MgCNi3 and YRh3B superconductors is also shown, finding favorable trends for superconductivity.

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Magnetic and Neutron Investigation of the σ‐Phase of FeCr

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AIP Conference Proceedings 2006年第1期850卷 1273-1274页

作者： J. Cieslak M. Reissner W. Steiner S. M. Dubiel Faculty of Physics and Applied Computer Science AGH University of Science and Technology Kraków Poland Institute of Solid State Physics Vienna University of Technology Wien Austria

The σ‐phase of FexCr1−x, x = 0.50 − 0.56, was investigated by neutron, magnetization and high field 57Fe Mössbauer measurements to gain information about the magnetic ground state. Low ordered and high paramagnetic moments indicate strongly delocalized Fe‐moments. Local hyperfine fields for the five crystallographically different lattice sites were determined, which are non linearly related to the moments, indicating that large valence contributions to the hyperfine fields are present.

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Low Power Discriminators With Input Offsets Correction For Fast Multichannel Recording ASIC

Low Power Discriminators With Input Offsets Correction For F...

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International Conference on Mixed Design of Integrated Circuits and Systems (MIXDES)

作者： P. Grybo M. Idzik P. Maj K. Swientek Faculty of Physics and Applied Computer Science AGH University of Science and Technology Kraków Poland Faculty of Electrical Engineering Automatics Computer Science and Electronics Kraków Poland

Multichannel ASIC for digital X-ray imaging requires one or more discriminators in each recording channel. The critical parameters of these discriminators are low power consumption and low offset spreads from channel to channel. In the readout electronics dedicated to work with high rates of input pulses the charge sensitive amplifier, filter stages and discriminators are often DC coupled. Such approach generates additional channel to channel spread of DC level at discriminators inputs. In this paper we present the structure of discriminators pair, which allows to select pulses according to their amplitudes and can work effectively in multichannel fast readout ASIC due to additional correction circuits implemented in each channel. We present the architecture of the discriminators, the results of Monte Carlo simulations of input offsets spreads and the measurement results of such structures which were implemented in 64-channel ASIC fabricated in 0.35 mum CMOS technology

关键词： Disk recording Application specific integrated circuits Pulse amplifiers CMOS technology X-ray imaging Digital recording Energy consumption Readout electronics Filters Coupling circuits

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Integrated Charge Sensitive Amplifier with Pole-Zero Cancellation Circuit for High Rates

Integrated Charge Sensitive Amplifier with Pole-Zero Cancell...

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Proceedings of 2006 IEEE International Symposium on Circuits and Systems,Volume 4

作者： Pawel Grybos Marek Idzik Krzysztof Swientek Piotr Maj Faculty of Physics and Applied Computer Science AGH University of Science and Technology Cracow Poland Faculty of Electrical Engineering Automatics Computer Science and Electronics AGH University of Science and Technology Cracow Poland

We report on design and preliminary measurements of integrated charge sensitive amplifier dedicated to work with asynchronous high rate input signals. In this paper we discuss the trade-off between high rate operation of CSA and its noise, taking into account the negative effects of pile-up pulses in readout electronics. The key element in the presented fast CSA is a pole-zero cancellation circuit The architecture of the PZC circuit implemented in 0.35 μm CMOS technology is discussed in detailed. The first tests of high rate operation of CSA with PZC circuit up to 2 MHz of input signals are reported.

关键词： Pulse amplifiers Capacitive sensors Voltage CMOS technology Feedback circuits Integrated circuit technology Noise generators Pulse generation Readout electronics Pulse shaping methods

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