A sensitive low‐power homodyne reflectometer for impedance measurements at 0.25–1.0 GHz

We describe a single‐sideband homodyne reflectometer for sensitive impedance measurements in the 1 GHz range on electronic devices at liquid‐helium temperatures and below. At 50 pW measurement power, the instrument is capable of resolving a fractional change of 10−5 in the impedance of a nominally 5...

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Bibliographic Details
Published in:Review of scientific instruments 1994-02, Vol.65 (2), p.445-448
Main Authors: Pieper, John B., Price, John C.
Format: Article
Language:English
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Summary:We describe a single‐sideband homodyne reflectometer for sensitive impedance measurements in the 1 GHz range on electronic devices at liquid‐helium temperatures and below. At 50 pW measurement power, the instrument is capable of resolving a fractional change of 10−5 in the impedance of a nominally 50 Ω resistive device with a measurement time of one minute. We include details of an application to ac magnetoconductance measurements on mesoscopic devices, and an in situ calibration method for this application.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1145154