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|標題:||Instrumentation of a high-sensitivity microwave vector detection system for low-temperature applications||作者:||Suen, Y.W.
|關鍵字:||conductivity||Project:||Review of Scientific Instruments||期刊/報告no：:||Review of Scientific Instruments, Volume 76, Issue 8.||摘要:||
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. (c) 2005 American Institute of Physics.
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