(Charakterystyka cyfrowego ukladu SQUID do pomiarów pola magnetycznego o szerokim zakresie dynamiki) :
Characterization of a digital squid for magnetic field measurements with high dynamic range. - In: Elektronika, ISSN 0033-2089, Bd. 52 (2011), 6, S. 28-31
Measurements of extremely weak magnetic fields in unshielded environments require sensors providing a high dynamic range and slew rate while maintaining a high resolution. At present, analog Superconducting Quantum Interference Devices (SQUIDs) are the most sensitive sensors for magnetic flux. Due to their room-temperature feedback electronics necessary to maintain a stable point of operation, slew rates of those sensors are limited. The dynamic range is usually restricted by the resolution of classical analog to digital converters. The digital SQUID follows a different approach: a change of the magnetic field penetrating the pickup loop is translated by the sensor into a stream of voltage pulses. Each pulse represents the change of the magnetic flux inside the pickup loop by one flux quantum [Phi]0. By fast counting of these flux quanta, it is possible to outperform the analog SQUID in terms of dynamic range and maximum slew rate. We present our latest results with respect to the internal mechanisms of the digital SQUID and present a method to compensate the main source for nonlinear behavior of the sensor. The analyzed circuit was fabricated by FLUXONICS Foundry [1] in a 1 kA/cm2 niobium fabrication process.
Reduced power consumption in superconducting electronics. - In: IEEE transactions on applied superconductivity, ISSN 1558-2515, Bd. 21 (2011), 3, S. 770-775
Rapid single flux quantum (RSFQ) electronics is based on the Josephson junction as an active switching element. In standard RSFQ circuits its switching energy is much lower than the static power consumption caused by the resistive current distribution network. Due to this thermal heating of the chip, the maximum number of junctions on a single chip is limited to about 1 million. The frequency-dependent contribution to power dissipation from junction switchings is only about 2 percent of the static one. This fact limits the direct construction of VLSI systems for high-performance computing as well as small-scale circuit applications in the vicinity of ultra-sensitive detectors or even quantum circuits. We present an assessment of different approaches for reducing the static power consumption by investigating the potential of inductive bias distribution networks as well as reduced critical currents. We analyse the operation stability of simple digital circuits with 5 times smaller critical currents at 4.2 K. The combination of the reduced critical currents and inductive biasing can provide digital superconductive circuits with significantly reduced static power consumption. Index Terms-Josephson junction, magnetic field sensors, RSFQ, superconducting electronics.
https://doi.org/10.1109/TASC.2011.2117410
Outage performance analysis and code design for three-stage MMSE turbo equalization in frequency-selective Rayleigh fading channels. - In: IEEE transactions on vehicular technology, ISSN 1939-9359, Bd. 60 (2011), 2, S. 473-484
http://dx.doi.org/10.1109/TVT.2010.2096440
Micro- and nano-electromechanical resonators based on SiC and group III-nitrides for sensor applications. - In: Physica status solidi. Applications and materials science. - Weinheim : Wiley-VCH, 2005- , ISSN: 1862-6319 , ZDB-ID: 1481091-8, ISSN 1862-6319, Bd. 208 (2011), 2, S. 357-376
http://dx.doi.org/10.1002/pssa.201026343
An integrated SiGe HBT pulselength modulator for class-S power amplifiers in the UHF range. - In: IEEE transactions on circuits and systems. Regular papers / Institute of Electrical and Electronics Engineers. - New York, NY : Institute of Electrical and Electronics Engineers, 2004- , ISSN: 1558-0806 , ZDB-ID: 2028230-8, ISSN 1558-0806, Bd. 58 (2011), 1, S. 62-69
http://dx.doi.org/10.1109/TCSI.2010.2071510
Blind adaptive constrained constant-modulus reduced-rank interference suppression algorithms based on interpolation and switched decimation. - In: IEEE transactions on signal processing, ISSN 1941-0476, Bd. 59 (2011), 2, S. 681-695
http://dx.doi.org/10.1109/TSP.2010.2091274
A 1.25-Gb/s indoor cellular optical wireless communications demonstrator. - In: IEEE photonics technology letters, Bd. 22 (2010), 21, S. 1598-1600
http://dx.doi.org/10.1109/LPT.2010.2073696
Phase constant measurement of periodically structured surfaces - the leaky-wave region. - In: IEEE antennas and wireless propagation letters, ISSN 1548-5757, Bd. 9 (2010), S. 383-386
http://dx.doi.org/10.1109/LAWP.2010.2049091
Ultrawideband antennas for magnetic resonance imaging navigator techniques. - In: IEEE transactions on antennas and propagation, ISSN 1558-2221, Bd. 58 (2010), 6, S. 2107-2112
http://dx.doi.org/10.1109/TAP.2010.2046848
Indirect localization and imaging of objects in an UWB sensor network. - In: IEEE transactions on instrumentation and measurement, ISSN 0018-9456, Bd. 59 (2010), 11, S. 2949-2957
http://dx.doi.org/10.1109/TIM.2010.2046359