A 210-280 GHZ SIS HETERODYNE RECEIVER FOR THE JAMES CLERK MAXWELL TELESCOPE .2. CALIBRATION

被引：3
|
作者：
LITTLE, LT [1 ]
DAVIES, SR [1 ]
CUNNINGHAM, CT [1 ]
机构：
[1] RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND
来源：
INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES | 1992年 / 13卷 / 05期
关键词：
SIS-MIXER; QUASI-PARTICLE MIXER; MILLIMETER WAVES;
D O I：
10.1007/BF01010689
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：
The comparison of a 240 GHz SIS heterodyne receiver with a Schottky diode receiver at the Maxwell telescope revealed difficulties with its calibration using continuum loads. The difficulties arise from the fact that the local oscillator power is not hugely greater than the total load power incident across the RF and IR band. This broadband power influences the receiver gain, principally by varying the slope of the I-V characteristic, and hence the output matching as a result of the ac Josephson effect. Suppressing the Josephson effect with a magnetic field permits the standard calibration procedure, using hot/cold continuum loads, to be employed.
引用
收藏
页码：659 / 667
页数：9
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