A. Talalaevskii - Academia.edu (original) (raw)
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Papers by A. Talalaevskii
2003 IEEE International Reliability Physics Symposium Proceedings, 2003. 41st Annual., 2000
Light emission from SiGe heterojunction bipolar transistors (HBTs) was characterized for photon e... more Light emission from SiGe heterojunction bipolar transistors (HBTs) was characterized for photon emission microscopy applications. Radiative recombination dominates in the non-saturation regime. It increases in the saturation regime due to an increased concentration of minority charge carriers in the base. Hot electron radiation dominates in the avalanche and is suppressed at large collector currents due to base widening.
Physical Review B, 1996
We have investigated the angle and magnetic field dependence of the ac susceptibility in BiâSrâCa... more We have investigated the angle and magnetic field dependence of the ac susceptibility in BiâSrâCaCuâOâ and YBaâCuâOâ single crystals at low external fields. The ac field was applied perpendicular to the CuOâ planes. The first and third harmonics of the ac susceptibility exhibit remarkably sharp features when the dc field component perpendicular to the CuOâ planes passes a threshold field
Journal of Instrumentation, 2007
The purpose, design specifications, construction techniques, and testing methods are described fo... more The purpose, design specifications, construction techniques, and testing methods are described for the high voltage feedthrough ports and filters of the ATLAS Liquid Argon calorimeters. These feedthroughs carry about 5000 high voltage wires from a room-temperature environment (300 K) through the cryostat walls to the calorimeters cells (89 K) while maintaining the electrical and cryogenic integrity of the system. The feedthrough wiring and filters operate at a maximum high voltage of 2.5 kV without danger of degradation by corona discharges or radiation at the Large Hadron Collider.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001
The DØ preshower detector consists of scintillator strips with embedded wavelength-shifting fiber... more The DØ preshower detector consists of scintillator strips with embedded wavelength-shifting fibers, and a readout using Visible Light Photon Counters. The response to minimum ionizing particles has been tested with cosmic ray muons. We report results on the gain calibration and light-yield distributions. The spatial resolution is investigated taking into account the light sharing between strips, the effects of multiple scattering and various systematic uncertainties. The detection efficiency and noise contamination are also investigated. 1
IEICE Transactions on Electronics, 2008
Digital superconductor electronics has been experiencing rapid maturation with the emergence of s... more Digital superconductor electronics has been experiencing rapid maturation with the emergence of smaller-scale, lower-cost communications applications which became the major technology drivers. These applications are primarily in the area of wireless communications, radar, and surveillance as well as in imaging and sensor systems. In these areas, the fundamental advantages of superconductivity translate into system benefits through novel Digital-RF architectures with direct digitization of wide band, high frequency radio frequency (RF) signals. At the same time the availability of relatively small 4 K cryocoolers has lowered the foremost market barrier for cryogenically-cooled digital electronic systems. Recently, we have achieved a major breakthrough in the development, demonstration, and successful delivery of the cryocooled superconductor digital-RF receivers directly digitizing signals in a broad range from kilohertz to gigahertz. These essentially hybrid-technology systems combine a variety of superconductor and semiconductor technologies packaged with two-stage commercial cryocoolers: cryogenic Nb mixed-signal and digital circuits based on Rapid Single Flux Quantum (RSFQ) technology, room-temperature amplifiers, FPGA processing and control circuitry. The demonstrated cryocooled digital-RF systems are the world's first and fastest directly digitizing receivers operating with live satellite signals in X-band and performing signal acquisition in HF to L-band at ∼30 GHz clock frequencies.
IEEE Transactions on Applied Superconductivity, 2000
We describe several improvements that are being pursued to improve the dynamic range of lowpass p... more We describe several improvements that are being pursued to improve the dynamic range of lowpass phase modulation-demodulation (PMD) analog-to-digital converters (ADC). The existing ADC has been tested at sampling frequencies up to 29.44 GHz; a 89.15 dB signal to noise ratio (SNR) is achieved for a 10 MHz sinusoidal input, with the noise being measured in a reference 10 MHz
IEEE Transactions on Applied Superconductivity, 2000
HYPRES is developing a class of digital receivers featuring direct digitization at radio frequenc... more HYPRES is developing a class of digital receivers featuring direct digitization at radio frequency (RF). Such a receiver consists of a wideband analog-to-digital converter (ADC) modulator and multiple digital channelizer units to extract different frequency bands-of-interest within the broad digitized spectrum. The single-bit oversampled data, from either a lowpass delta or bandpass delta-sigma modulator, are applied to one or more channelizers, each comprising digital in-phase and quadrature mixers and a pair of digital decimation filters. We perform channelization in two steps, the first at full ADC sampling clock frequency with rapid single flux quantum (RSFQ) digital circuits and the second at reduced (decimated) clock frequency with commercial field programmable gate array (FPGA) chips at room temperature. We have demonstrated lowpass and bandpass digital receivers by integrating an ADC modulator and a channelizer unit on the same chip at clock frequencies up to 20 GHz. These 1-cm 2 single-chip digital-RF receivers contain over 10,000 Josephson junctions. The channelizing receiver approach can be extended to include multiple ADC modulators and multiple channelizer units on a multi-chip module.
IEEE Transactions on Applied Superconductivity, 2000
HYPRES has developed a high-resolution, dynamically programmable analog-to-digital converter (ADC... more HYPRES has developed a high-resolution, dynamically programmable analog-to-digital converter (ADC) for radar and communications applications. The ADC uses the phase modulation-demodulation low-pass architecture and on-chip digital filtering. Detailed experimental results at 20 GHz clock frequency of the ADC chip fabricated with a 1 kA cm 2 Nb process are presented and discussed. In addition to the standard ADC configuration, different ADC modifications are described. In the multirate ADC, the modulator sampling frequency is the twice the clock frequency for the time-interleaved digital filter. In addition to the standard parallel-output ADC, a serial output ADC and its interface to room temperature electronics are developed. This serial ADC chip fabricated with the advanced HYPRES 4.5 kA cm 2 process operated up to 34 GHz clock. As a major step toward commercialization of superconducting electronics, an ADC chip was successfully packaged on a cryocooler where it showed reduced performance up to 11.52 GHz clock.
IEEE Transactions on Applied Superconductivity, 2000
Superconductor digital receiver systems of increasing functionality, modularity and user-friendli... more Superconductor digital receiver systems of increasing functionality, modularity and user-friendliness have been developed. The modular design methodology ensures that within its input-output and heat load capacity, the system can be reconfigured to perform a different function by changing the chip module and by reprogramming FPGA-based digital signal processors. One of the systems (ADR-004), originally equipped with a 10×10 mm 2 channelizing receiver chip for signals intelligence application, was reconfigured with a 5×5 mm 2 1.1-GHz bandpass ADC chip to perform world's first multi-net Link-16 demonstration in a setting capable of operational use. Substantial improvements in system integration have been obtained in each successive generation of digital-RF receiver systems. The latest (third) generation system (ADR-005), hosting a 5×5 mm 2 7.5-GHz bandpass ADC chip and an FPGA channelizer, successfully repeated the over-the-air SATCOM demonstration performed previously using a 1-cm 2 single-chip bandpass digital receiver with an on-chip superconductor channelizer. This system ran error-free for over 12 hours with and without a low-noise amplifier. To our knowledge, this is the first time an X-band SATCOM receiver has been operated without analog amplification and down-conversion in a military application.
AIP Conference Proceedings, 2008
We have demonstrated the full operation of digital RF receivers on a HYPRES‐designed cryostat, wh... more We have demonstrated the full operation of digital RF receivers on a HYPRES‐designed cryostat, which couples an Nb‐based superconducting Rapid Single Flux Quantum (RSFQ) chip to a commercially available 100 mW 4 Kelvin Gifford‐McMahon cryocooler. ...
2003 IEEE International Reliability Physics Symposium Proceedings, 2003. 41st Annual., 2000
Light emission from SiGe heterojunction bipolar transistors (HBTs) was characterized for photon e... more Light emission from SiGe heterojunction bipolar transistors (HBTs) was characterized for photon emission microscopy applications. Radiative recombination dominates in the non-saturation regime. It increases in the saturation regime due to an increased concentration of minority charge carriers in the base. Hot electron radiation dominates in the avalanche and is suppressed at large collector currents due to base widening.
Physical Review B, 1996
We have investigated the angle and magnetic field dependence of the ac susceptibility in BiâSrâCa... more We have investigated the angle and magnetic field dependence of the ac susceptibility in BiâSrâCaCuâOâ and YBaâCuâOâ single crystals at low external fields. The ac field was applied perpendicular to the CuOâ planes. The first and third harmonics of the ac susceptibility exhibit remarkably sharp features when the dc field component perpendicular to the CuOâ planes passes a threshold field
Journal of Instrumentation, 2007
The purpose, design specifications, construction techniques, and testing methods are described fo... more The purpose, design specifications, construction techniques, and testing methods are described for the high voltage feedthrough ports and filters of the ATLAS Liquid Argon calorimeters. These feedthroughs carry about 5000 high voltage wires from a room-temperature environment (300 K) through the cryostat walls to the calorimeters cells (89 K) while maintaining the electrical and cryogenic integrity of the system. The feedthrough wiring and filters operate at a maximum high voltage of 2.5 kV without danger of degradation by corona discharges or radiation at the Large Hadron Collider.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001
The DØ preshower detector consists of scintillator strips with embedded wavelength-shifting fiber... more The DØ preshower detector consists of scintillator strips with embedded wavelength-shifting fibers, and a readout using Visible Light Photon Counters. The response to minimum ionizing particles has been tested with cosmic ray muons. We report results on the gain calibration and light-yield distributions. The spatial resolution is investigated taking into account the light sharing between strips, the effects of multiple scattering and various systematic uncertainties. The detection efficiency and noise contamination are also investigated. 1
IEICE Transactions on Electronics, 2008
Digital superconductor electronics has been experiencing rapid maturation with the emergence of s... more Digital superconductor electronics has been experiencing rapid maturation with the emergence of smaller-scale, lower-cost communications applications which became the major technology drivers. These applications are primarily in the area of wireless communications, radar, and surveillance as well as in imaging and sensor systems. In these areas, the fundamental advantages of superconductivity translate into system benefits through novel Digital-RF architectures with direct digitization of wide band, high frequency radio frequency (RF) signals. At the same time the availability of relatively small 4 K cryocoolers has lowered the foremost market barrier for cryogenically-cooled digital electronic systems. Recently, we have achieved a major breakthrough in the development, demonstration, and successful delivery of the cryocooled superconductor digital-RF receivers directly digitizing signals in a broad range from kilohertz to gigahertz. These essentially hybrid-technology systems combine a variety of superconductor and semiconductor technologies packaged with two-stage commercial cryocoolers: cryogenic Nb mixed-signal and digital circuits based on Rapid Single Flux Quantum (RSFQ) technology, room-temperature amplifiers, FPGA processing and control circuitry. The demonstrated cryocooled digital-RF systems are the world's first and fastest directly digitizing receivers operating with live satellite signals in X-band and performing signal acquisition in HF to L-band at ∼30 GHz clock frequencies.
IEEE Transactions on Applied Superconductivity, 2000
We describe several improvements that are being pursued to improve the dynamic range of lowpass p... more We describe several improvements that are being pursued to improve the dynamic range of lowpass phase modulation-demodulation (PMD) analog-to-digital converters (ADC). The existing ADC has been tested at sampling frequencies up to 29.44 GHz; a 89.15 dB signal to noise ratio (SNR) is achieved for a 10 MHz sinusoidal input, with the noise being measured in a reference 10 MHz
IEEE Transactions on Applied Superconductivity, 2000
HYPRES is developing a class of digital receivers featuring direct digitization at radio frequenc... more HYPRES is developing a class of digital receivers featuring direct digitization at radio frequency (RF). Such a receiver consists of a wideband analog-to-digital converter (ADC) modulator and multiple digital channelizer units to extract different frequency bands-of-interest within the broad digitized spectrum. The single-bit oversampled data, from either a lowpass delta or bandpass delta-sigma modulator, are applied to one or more channelizers, each comprising digital in-phase and quadrature mixers and a pair of digital decimation filters. We perform channelization in two steps, the first at full ADC sampling clock frequency with rapid single flux quantum (RSFQ) digital circuits and the second at reduced (decimated) clock frequency with commercial field programmable gate array (FPGA) chips at room temperature. We have demonstrated lowpass and bandpass digital receivers by integrating an ADC modulator and a channelizer unit on the same chip at clock frequencies up to 20 GHz. These 1-cm 2 single-chip digital-RF receivers contain over 10,000 Josephson junctions. The channelizing receiver approach can be extended to include multiple ADC modulators and multiple channelizer units on a multi-chip module.
IEEE Transactions on Applied Superconductivity, 2000
HYPRES has developed a high-resolution, dynamically programmable analog-to-digital converter (ADC... more HYPRES has developed a high-resolution, dynamically programmable analog-to-digital converter (ADC) for radar and communications applications. The ADC uses the phase modulation-demodulation low-pass architecture and on-chip digital filtering. Detailed experimental results at 20 GHz clock frequency of the ADC chip fabricated with a 1 kA cm 2 Nb process are presented and discussed. In addition to the standard ADC configuration, different ADC modifications are described. In the multirate ADC, the modulator sampling frequency is the twice the clock frequency for the time-interleaved digital filter. In addition to the standard parallel-output ADC, a serial output ADC and its interface to room temperature electronics are developed. This serial ADC chip fabricated with the advanced HYPRES 4.5 kA cm 2 process operated up to 34 GHz clock. As a major step toward commercialization of superconducting electronics, an ADC chip was successfully packaged on a cryocooler where it showed reduced performance up to 11.52 GHz clock.
IEEE Transactions on Applied Superconductivity, 2000
Superconductor digital receiver systems of increasing functionality, modularity and user-friendli... more Superconductor digital receiver systems of increasing functionality, modularity and user-friendliness have been developed. The modular design methodology ensures that within its input-output and heat load capacity, the system can be reconfigured to perform a different function by changing the chip module and by reprogramming FPGA-based digital signal processors. One of the systems (ADR-004), originally equipped with a 10×10 mm 2 channelizing receiver chip for signals intelligence application, was reconfigured with a 5×5 mm 2 1.1-GHz bandpass ADC chip to perform world's first multi-net Link-16 demonstration in a setting capable of operational use. Substantial improvements in system integration have been obtained in each successive generation of digital-RF receiver systems. The latest (third) generation system (ADR-005), hosting a 5×5 mm 2 7.5-GHz bandpass ADC chip and an FPGA channelizer, successfully repeated the over-the-air SATCOM demonstration performed previously using a 1-cm 2 single-chip bandpass digital receiver with an on-chip superconductor channelizer. This system ran error-free for over 12 hours with and without a low-noise amplifier. To our knowledge, this is the first time an X-band SATCOM receiver has been operated without analog amplification and down-conversion in a military application.
AIP Conference Proceedings, 2008
We have demonstrated the full operation of digital RF receivers on a HYPRES‐designed cryostat, wh... more We have demonstrated the full operation of digital RF receivers on a HYPRES‐designed cryostat, which couples an Nb‐based superconducting Rapid Single Flux Quantum (RSFQ) chip to a commercially available 100 mW 4 Kelvin Gifford‐McMahon cryocooler. ...