ISSTT Proceedings

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Wideband SIS Receivers Using Series Distributed SIS Junction Array

Authors:
Edward Tong, Paul Grimes, Ray Blundell, Ming-jye Wang, Takashi Noguchi
Abstract:
We have developed an SIS mixer based on a 3-junction series array. In this new mixer layout, shown in Fig. 1, the 3 junctions are connected together by passive network elements, such that each junction is subjected to a different Local Oscillator drive, both in amplitude and phase. In addition, since the junctions are connected in series, they have slightly different bias voltages. Only the DC bias current is the same in each of the junctions. This design helps to reduce the IF output capacitance of the mixer so as to achieve a wider IF bandwidth. We have made receiver noise measurements on a 200 GHz receiver incorporating this type of mixer chip, the results are summarized in Fig 2. From the figure, the lowest DSB noise temperature measured was ~32 K, and the noise temperature remains below 50 K over the IF range from 3 – 12 GHz.
Categories:
Detectors
Year:
2012
Session:
2
Full-text:
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Page Number(s):
12