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Instrumentation of a high-sensitivity microwave vector detection system for low-temperature applications

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5 Author(s)
Suen, Y.W. ; Department of Physics, National Chung Hsing University, No. 250, Kuo-Kuang Road, Taichung 402, Taiwan, Republic of China ; Hsieh, W.H. ; Chen, C.L. ; Li, L.C.
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We present the design and the circuit details of a high-sensitivity microwave vector detection system, which is aiming to study the low-dimensional electron system embedded in the slots of a coplanar waveguide at low temperatures. The coplanar waveguide sample is placed inside a phase-locked loop; the phase change of the sample may cause a corresponding change in the operation frequency, which can be measured precisely. We also employ a double-pulse modulation on the microwave signals, which comprises a fast pulse modulation for gated averaging and a slow pulse modulation for lock-in detection. In measurements on real samples at low temperatures, this system provides much better resolutions in both amplitude and phase than most of the conventional vector analyzers at power levels below -65 dBm in the frequency range from 100 MHz to 18 GHz.

Published in:

Review of Scientific Instruments  (Volume:76 ,  Issue: 8 )

Date of Publication:

Aug 2005

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