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1481. http://www.cplire.ru/html/lab234/pubs/2003-07.pdf
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, VOL. ... 2, JUNE 2003 3301 Texture-Related Roughness of (Nb,Ti)N Sputter-Deposited Films N. N. Iosad, N. M. van der Pers, S. Grachev, M. Zuiddam, B. D. Jackson, P. N. Dmitriev, and T. M. Klapwijk Abstract--We study the properties of (Nb,Ti)N films deposited by reactive magnetron sputtering in an atmosphere of argon and nitrogen at ambient substrate temperature, focusing, in particular, on the technological factors determining film texture and roughness. ...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2003-07.pdf -- 1957.1 Кб -- 28.02.2005
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1482. http://www.cplire.ru/html/lab234/pubs/2003-01.pdf
... 2, JUNE 2003 107 High Quality Nb-based Tunnel Junctions for High Frequency and Digital Applications Pavel N. Dmitriev, Irina L. Lapitskaya, Liudmila V. Filippenko, Andrey B. Ermakov, Sergey V. Shitov, Georgy V. Prokopenko, Sergey A. Kovtonyuk, and Valery P. Koshelets Abstract--A number of new fabrication techniques are developed and optimized in order to fit the requirements of contemporary superconducting electronics. ... The IV characteristic of Nb-AlN-Nb junction of 0.03 m area is presented in...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2003-01.pdf -- 249.1 Кб -- 28.02.2005
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1483. http://www.cplire.ru/html/lab234/pubs/2003-08.pdf
OTu1 1 Influence of Geometry and Bias on Linewidth of Josephson Flux Flow Oscillators Jesper Mygind, Carsten E. Mahaini, Mogens R. Samuelsen, Alexander S. Sobolev, Mikhail Y. Torgashin, and Valery P. Koshelets 1 Abstract--The Flux Flow Oscillator (FFO) is a long Joseph-son junction in which a DC bias current and a DC magnetic field maintain a unidirectional viscous flow of magnetic quanta (fluxons). ... Practically, a DC current, Icl, in an integrated "control" line supplies the magnetic field. ...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2003-08.pdf -- 135.9 Кб -- 28.02.2005
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1484. http://www.cplire.ru/html/lab234/pubs/2003-09.pdf
ITu3 1 Superconducting Integrated Circuits for Submillimeter Heterodyne Receivers S.V. Shitov all N junctions with equal bias voltage via high inductive superconducting feeds [5], [6]. ... The concept of perfect match for SIS mixers assumes proper integration of multiple junctions using series-parallel connection. Our recent progress in study of Josephson-type oscillators up to 1 THz is based on their integration with SIS mixers, dc-break filters and high-ratio impedance transformers. ... Appl. ...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2003-09.pdf -- 147.1 Кб -- 28.02.2005
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1485. http://www.cplire.ru/html/lab234/pubs/2003-10.pdf
... The device comprises a double-dipole lens-antenna SIS-mixer pumped by an integrated Josephson-type phase-locked flux-flow oscillator (FFO), which provides the rf power also for a PLL harmonic mixer integrated on the same silicon chip of size 4 mm x 4 mm x 0.3 mm. ... Fig. 1 General chip layout. ... 10 -15 -20 FFO Power (dBm) Experimental Data Symmeterizated Data Lorentzian Gaussian -25 -30 -35 -40 -45 -50 431,56 431,58 431,60 431,62 431,64 FFO Frequency (GHz) Fig. ...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2003-10.pdf -- 194.0 Кб -- 28.02.2005
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1486. http://www.cplire.ru/html/lab234/pubs/2003-11.pdf
... A sub millimeter wave limb- sounder with superconducting (SIS) receivers cooled to 4K could meet these requirements. ... Although the frequency range has been extended up to 2500 GHz, it still employs uncooled Schottky diodes, and a double gas laser to p ump the 2.5 THz mixer. ... The ambitious spectral coverage of the TELIS instrument is accomplished by use of three independent frequency channels: 500 GHz, 650 GHz and 1.8 THz. ... RAL 500 GHz compact SIS receiver channel. ...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2003-11.pdf -- 302.5 Кб -- 28.02.2005
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1487. http://www.cplire.ru/html/lab234/pubs/2003-12.pdf
Integrated Submillimeter and Terahertz Receivers with Superconducting Oscillator V.P. Koshelets1,2, S.V. Shitov1,2, P.N. Dmitriev1, A.B. Ermakov1, L.V.Filippenko1, P. Yagoubov2, R. Hoogeveen2, T. de Graauw2 P.R. Wesselius2, S. Kohjiro3, Z. Wang4 Institute of Radio Engineering and Electronics, Moscow, Russia National Institute for Space Research (SRON), Groningen, the Netherlands National ... A compact array of 9 SIRs has been developed and tested. ...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2003-12.pdf -- 83.9 Кб -- 28.02.2005
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1488. http://www.cplire.ru/html/lab234/pubs/2003-13.pdf
Abstract submitted for EUCAS'2003, Sorrento, Italy Spectral Linewidth of Josephson Flux Flow Oscillators; influence from bias and geometry J. Mygind, C. Mahaini, M.R. Samuelsen Department of Physics, B309, Technical University of Denmark, Lyngby, Denmark A.V. Sobolev, M.Y Torgashin, V.P. Koshelets Institute of Radio Engineering and Electronics, RAS, Moscow, Russia Abstract Presently the Josephson Flux Flow Oscillator ( ...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2003-13.pdf -- 77.4 Кб -- 28.02.2005
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1489. http://www.cplire.ru/html/lab234/pubs/2003-14.pdf
... Comprehensive measurements of the FFO radiation linewidth are performed using an integrated harmonic SIS mixer; the FFO linewidth and spectral line profile is compared to a theory. ... To optimize the FFO design, influence of the FFO parameters on the radiation linewidth is studied. Novel FFO design at a moderate current density has resulted in a free-running FFO linewidth of about 10 MHz in the flux flow regime up to 712 GHz being limited only by the gap frequency of Nb. ...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2003-14.pdf -- 184.1 Кб -- 28.02.2005
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1490. http://www.cplire.ru/html/lab234/pubs/2003-15.pdf
... In order to cover the most important atmospheric species three frequency channels have been selected: 500 GHz, 600-650 GHz and 1.8 THz. The 600-650 GHz channel is based on a Superconducting Integrated Receiver (SIR), which is developed in cooperation between IREE and SRON. SIR is the on-chip combination of a low-noise SIS mixer with quasioptical antenna and a superconducting Flux Flow Oscillator (FFO) acting as Local Oscillator (LO). ... Schematic of the SIR chip. ...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2003-15.pdf -- 62.8 Кб -- 28.02.2005
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1491. http://www.cplire.ru/html/lab234/pubs/2003-16.pdf
... Dated: August 21, 2003) The Flux Flow Oscillator is a long Josephson junction in which a DC bias current and a DC magnetic field maintain a unidirectional viscous flow of magnetic flux quanta. ... The Flux Flow Oscillator (FFO) differs from the other members of the Josephson oscillator family by needing also an applied DC magnetic field, usually generated by an external current in one of the junction electrodes or in a separate "control" line. ... Now the measured normalized I-V curve is ? ...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2003-16.pdf -- 144.0 Кб -- 28.02.2005
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1492. http://www.cplire.ru/html/lab234/pubs/2002-01.pdf
Physica C 372-376 (2002) 316-321 www.elsevier.com/locate/physc Line width of Josephson flux flow oscillators V.P . Koshelets a,b,*, P.N. Dmitriev a, A.S. Sobolev a, A.L. Pankratov c, V.V. Khodos c, V.L. Vaks c, A.M. Baryshev b, P.R. Wesselius b, J. Mygind ... of Denmark, B 309, DK-2800 Lyngby, Denmark Abstract A combination of wide-band electronic tunability and moderate free-running line width makes the Josephson flux flow oscillator ( ... 2] V.P. Koshelets, S.V. Shitov, Supercond. ...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2002-01.pdf -- 235.6 Кб -- 28.02.2005
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1493. http://www.cplire.ru/html/lab234/pubs/2002-02.pdf
Physica C 367 (2002) 249н255 www.elsevier.com/locate/physc Towards a phase -locked superconducting integrated receiver : prospects and limitations V.P . Koshelets a,b,*, S.V. Shitov a,b, P.N. Dmitriev a, A.B. Ermakov a, L.V. Filippenko a, V.V. Khodos c, V.L. Vaks c, A.M. Baryshev b, P.R. Wesselius ... A linewidth of a phase-locked FFO as low as 1 Hz has been measured relative to an external reference oscillator in the frequency range 270н440 GHz on steep Fiske steps in the low damping regime. ...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2002-02.pdf -- 340.3 Кб -- 28.02.2005
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1494. http://www.cplire.ru/html/lab234/pubs/2002-03.pdf
... A receiver DSB noise temperature below 100 K has been achieved for a superconducting integrated receiver (SIR) operating with an internal FFO in the frequency range 480 - 520 GHz. ... This narrow free-running linewidth along with the construction of a wide-band PLL system has enabled us to phase lock the FFO throughout the frequency range 490 ґ 712 GHz where continuous frequency tuning is possible. ... Fig. ... Fig. 7 demonstrates the spectra of the frequency and phase locked FFO operating at 707...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2002-03.pdf -- 233.1 Кб -- 28.02.2005
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1495. http://www.cplire.ru/html/lab234/pubs/2002-04.pdf
... The sensor of the phase-locked receiver comprises a quasioptical double-dipole antenna SIS mixer (TRX 250 K, DSB), a Josephson-type flux-flow oscillator (FFO) and a twin-SIS harmonic mixer, all integrated on the same silicon chip of size 4 mm by 4 mm. ... 200 Sample H8-0480: SIS mixer current (?A) 150 Phase-locked FFO @ 325.5 GHz (LSB) VFFO= 673.0 ?V ICL FFO= 25.9 mA ICL SIS= 68 mA T = 4.2 K IFFO= 42.7mA 41.0 mA 39.1 mA 37.6 mA No pump 100 50 0 0.0 1.0 2.0 3.0 4.0 5.0 SIS mixer voltage (mV) Fig. ...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2002-04.pdf -- 324.0 Кб -- 28.02.2005
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1496. http://www.cplire.ru/html/lab234/pubs/2002-05.pdf
... Local oscillators based on Nb-AlOx-Nb FFOs have been successfully tested from about 120 to 700 GHz (gap frequency of Nb) providing enough power to pump an SIS-mixer (about 1 ?W at 450 GHz); both the frequency and the power of the FFO can be dc-tuned. ... Fig. ... Fig. 5 demonstrates the spectra of the frequency and phase locked FFO operating at 707 GHz. ... The absolute FFO phase noise (solid lines in Fig. 6) is dominated by the reference oscillator noise for offsets < 1 MHz. ...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2002-05.pdf -- 230.0 Кб -- 28.02.2005
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1497. http://www.cplire.ru/html/lab234/pubs/2002-14.pdf
... N thin films Department of Applied Physics (DIMES), Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands N. M. van der ... 2628 CJ Delft, The Netherlands Received 12 December 2001; accepted 9 August 2002 We studied the properties of ( Nb0.7 ,Ti0.3) N films deposited by reactive magnetron sputtering in an atmosphere of argon and nitrogen at ambient substrate temperature, with a particular focus on the technological factors that determine ... 5001 FIG. ... FIG. ...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2002-14.pdf -- 245.1 Кб -- 28.02.2005
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1498. http://www.cplire.ru/html/lab234/pubs/2002-15.pdf
... Utilization of the AlNx tunnel barrier, produced by Al nitridation in a nitrogen glow discharge, enables us to produce high-quality SIS junctions with low Rn A values (a product of junction resistance and area). We characterize the tunnel barrier formation and investigate the correlation of plasma characteristics and junction properties. ... Therefore we focus on the characterization of the AlNx tunnel barrier formation and the correlation of plasma characteristics with junction properties. ...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2002-15.pdf -- 136.8 Кб -- 28.02.2005
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1499. http://www.cplire.ru/html/lab234/pubs/2002-16.pdf
... 11, Moscow, 101999 Russia e-mail: Sergey@hitech.cplire.ru ** National Institute for Space Research of the Netherlands (SRON), Groningen, the Netherlands *** Delft University of Technology (DIMES), Delft, the Netherlands Received January 30, 2002 Abstract--A quasi-optical mixer containing two Nb/Al/AlOx/Nb superconducting tunnel junctions integrated into a NbTiN/SiO2 /Al microstrip line is studied experimentally in the 800ґ1000 GHz frequency range. ... The mixer is optimized for the IF band of 4ґ8...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2002-16.pdf -- 208.1 Кб -- 28.02.2005
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1500. http://www.cplire.ru/html/lab234/pubs/2002-17.pdf
... The ambitious spectral coverage of the TELIS instrument is accomplished by use of three frequency channels: 500 GHz, 650 GHz and 1.8 THz. All channels will use a state-of-the-art superconducting SIS and HEB mixer technology. ... 650 GHz receiver A key element of this channel is Superconducting Integrated Receiver (SIR), that comprises on one chip a low-noise SIS mixer with quasioptical antenna and a superconducting Flux Flow Oscillator (FFO) acting as LO [2]. ...
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Ссылки http://www.cplire.ru/html/lab234/pubs/2002-17.pdf -- 288.5 Кб -- 28.02.2005
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