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PARALLEL BIASED SIS-ARRAYS FOR MM WAVE MIXERS: MAIN IDEAS AND EXPERIMENTAL VERIFICATION

Ussr

Published Jan 1, 1991• 0 citations
OpenAlex

Abstract

The possibility to overcome the main drawbacks of the traditional series arrays by parallel connection of the SIS junctions for dc and IF have been experimentally demonstrated. The proposed mixing elements i) avoid the influence of the junction nonuniformity in the array; ii) provide the optimal matching on both rf input and IF output; iii) tune out junction capacitance. Experimentally tested arrays contained up to 8 high quality Nb-AIOx-Nb jun

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The possibility to overcome the main drawbacks of the traditional series arrays by parallel connection of the SIS junctions for dc and IF have been experimentally demonstrated. The proposed mixing elements i) avoid the influence of the junction nonuniformity in the array; ii) provide the optimal matching on both rf input and IF output; iii) tune out junction capacitance. Experimentally tested arrays contained up to 8 high quality Nb-AIOx-Nb jun
The possibility of overcoming the main drawbacks of the traditional series arrays by parallel connection of the SIS (superconductor-insulator-superconductor) junctions for DC and IF are demonstrated experimentally. The proposed mixing elements avoid the influence of the junction nonuniformity in the array, provide the optimal matching on both RF input and IF output, and tune out junction capacitance. Experimentally tested arrays contained up to eight high-quality Nb-AlO/sub x/-Nb junctions with R/sub n/=20-70 Omega at junction area 8/14 mu m/sup 2/. The best values of T/sub r/ (SSB) were measured to as low as 5 K on the mixer cold input flange in the 45-55-GHz bandwidth at an ambient temperature of 4.2 K. A mixer gain of up to 10 dB was obtained. The gain values were limited by bias stability at very high or even negative array output impedance. An experimental receiver noise temperature (SSB) of less than 20 K has been achieved.
The possibility of overcoming the main drawbacks of the traditional series arrays by using a parallel connection of SIS junctions for DC and IF current has been experimentally demonstrated in full height 70-116 GHz waveguide mixers. This new array concept has been successfully developed to: (i) avoid the influence of junction non-uniformity in the array; (ii) provide optimal matching at both RF input and IF output even in the case of high gain, and (iii) tune out junction capacitance without any DC blocks. The experimentally tested arrays contain 10 or 11 trilayer 2.5 mu m 2 Nb-AlO x -Nb junctions. Best values of T r (DSB) as low as 20+or-2 K have been measured at the receiver room temperature horn in the 104-108 GHz LO range with a 4 GHz IF and at a mixer ambient temperature of 4.5-5.5 K. An SSB mixer noise temperature as low as 6+or-3 K was estimated. This value is very close to the quantum noise limit hf/k approximately=5 K.
Parallel connected for dc and IF, but in series for rf current SIS junction arrays are under investigation since 1982. Novel conception of the improved matching for both input and output mixer ports have been developed and confirmed successfully with experimental receivers in 40-180 GHz frequency range. Parallel and parallel-series combinations integrated up to 11 Nb-AlOx-Nb type SIS junctions have been tested in full height waveguide mixers. The receivers' noise temperatures Tr(DSB) I50K have been achieved in the laboratory tests across frequency range 40-150GHz. The Tr as low as 35K have been carefully measured at 145GHz. The parallel biased SIS arrays for integrated on a chip SIS receiver have been designed and tested successfully. The integrated receiver noise temperature as low as 85K was achieved at 140GHz. New SIS array design for mixer in frequency range 500-1000 GHz is presented.
Niobium based SIS junction structures for microwave receiving devices were investigated. The possibility of the mixing efficiency improving for Nb-Al2O3-Nb junctions with a negative resistance on I-V curve near the gap voltage has been demonstrated. Comparative microwave investigation of the parallel and series DC biased arrays shows the advantage of the first one. SIS junction capacitance has been compensated with microstrip or lumped elements at the signal frequency. Such compensated structures were investigated at frequencies 38 and 76 GHz both in waveguide and quasioptic systems.
We developed submillimeter superconducting oscillators using Josephson effects in the Nb-based superconductor-insulator-superconductor (SIS) parallel array. The radiation emitted from the array is detected using integrated SIS twin junctions. Despite the small junction number (N = 21), the (I-V ) characteristics of the detector clearly exhibit photon-assisted quasiparticle steps when the array is biased upon its Josephson resonances, ranging from 370 to 500 GHz. The array has a moderate current density (Jc≈= 6 kA/cm2) but provides an output power around 0.28 μW, which would be sufficient in achieving sensitive heterodyne reception. The impedance array can be matched easier to microwave circuits than the usual long Josephson junctions. Furthermore, the parallel array approach can be also extended up to about 1.4 THz using Nb-based SIS junctions.