PERFORMANCE OF NBN SUPERCONDUCTIVE TUNNEL-JUNCTIONS AS SIS MIXERS AT 205 GHZ

被引:23
作者
MCGRATH, WR
STERN, JA
JAVADI, HHS
CYPHER, SR
HUNT, BD
LEDUC, HG
机构
[1] Center for Space Microelectronics Technology, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109
基金
美国国家航空航天局;
关键词
D O I
10.1109/20.133756
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We have fabricated small area (less-than-or-equal-to 1-mu-2), high current density NbN/MgO/NbN tunnel junctions with I-V characteristics suitable for high frequency mixers. Mesa-geometry junctions with an area of about 1-mu-2 and critical current density of 5-10kA/cm2 are integrated with superconducting microstrip lines designed to resonate out the junction capacitance. Accurate values of junction capacitance and magnetic penetration depth are required for the proper design of the microstrip. We have studied the mixer gain and noise performance near 205 GHz as a function of the inductance provided by the microstrip line. This has confirmed, at a high millimeter wave frequency, values of junction capacitance of 85 fF/mu-2 and recently measured values of magnetic penetration depth of 380 nm. Mixer noise as low as 134 K at 1.5 K has been obtained for properly-tuned junctions. We observe a significant improvement in mixer performance on cooling from 4.2 K to 1.5 K. Edge-geometry junctions with an area of 0.3-mu-2 and critical current density of 18-25 kA/cm2 have also been fabricated. These junctions give a mixer noise of 145 K at 4.2 K without the use of integrated tuning elements. These are the best results ever achieved for NbN-based SIS mixers.
引用
收藏
页码:2650 / 2653
页数:4
相关论文
共 14 条
[1]   A 345GHZ SIS RECEIVER FOR RADIO ASTRONOMY [J].
ELLISON, BN ;
SCHAFFER, PL ;
SCHAAL, W ;
VAIL, D ;
MILLER, RE .
INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES, 1989, 10 (08) :937-947
[2]   THEORETICAL CONSIDERATIONS FOR THZ SIS MIXERS [J].
FELDMAN, MJ .
INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES, 1987, 8 (10) :1287-1292
[3]   NBN/MGO/NBN EDGE-GEOMETRY TUNNEL-JUNCTIONS [J].
HUNT, BD ;
LEDUC, HG ;
CYPHER, SR ;
STERN, JA ;
JUDAS, A .
APPLIED PHYSICS LETTERS, 1989, 55 (01) :81-83
[4]  
JAYADI HHS, 1990, IN PRESS 15TH INT C
[5]   PICOSECOND PULSES ON SUPERCONDUCTING STRIPLINES [J].
KAUTZ, RL .
JOURNAL OF APPLIED PHYSICS, 1978, 49 (01) :308-314
[6]  
KERR AR, 1990, INT J IR MM WAVES, V11
[7]   SUBMICRON AREA NBN/MGO/NBN TUNNEL-JUNCTIONS FOR SIS MIXER APPLICATIONS [J].
LEDUC, HG ;
JUDAS, A ;
CYPHER, SR ;
BUMBLE, B ;
HUNT, BD ;
STERN, JA .
IEEE TRANSACTIONS ON MAGNETICS, 1991, 27 (02) :3192-3195
[8]   VARIABLE-TEMPERATURE LOADS FOR USE IN ACCURATE NOISE MEASUREMENTS OF CRYOGENICALLY-COOLED MICROWAVE-AMPLIFIERS AND MIXERS [J].
MCGRATH, WR ;
RAISANEN, AV ;
RICHARDS, PL .
INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES, 1986, 7 (04) :543-553
[9]   ACCURATE EXPERIMENTAL AND THEORETICAL COMPARISONS BETWEEN SUPERCONDUCTOR-INSULATOR-SUPERCONDUCTOR MIXERS SHOWING WEAK AND STRONG QUANTUM EFFECTS [J].
MCGRATH, WR ;
RICHARDS, PL ;
FACE, DW ;
PROBER, DE ;
LLOYD, FL .
JOURNAL OF APPLIED PHYSICS, 1988, 63 (08) :2479-2491
[10]   BROAD-BAND RF MATCH TO A MILLIMETER-WAVE SIS QUASI-PARTICLE MIXER [J].
RAISANEN, AV ;
MCGRATH, WR ;
RICHARDS, PL ;
LLOYD, FL .
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 1985, 33 (12) :1495-1500