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I am using Keithley semiconductor characterization system 4200 with CVU module and I am measuring the impedance along with the frequency of fabricated semiconductor micro-inductors. I finally want to extract the inductance of the micro-coils which is estimated to be in the range of nH.
In my attempt to improve the accuracy of my measurements I calibrate the CVUs by performing the open and short corrections. Also I use the confidence check before the open and short corrections and I receive a warning which I believe affects the open correction. The warning during the open confidence check says:"HI side source and sense cables appear to be heavily loaded!" and "LO side source and sense cables appear to be heavily loaded!". The short correction confidence check seems to be ok.
The results after applying both corrections are strange. I even receive negative resistance!
Do you have any idea why this is happening and how I could improve the measuring accuracy? Besides that, is the equipment capable of measuring so small inductances (I believe yes especially in the high frequency range)? If not, what equipment do you suggest for this type of measurements?
I haven't tried to connect the shields of the two probes. Is this important for frequencies up to 10MHz? Do you believe I need any type of specific needles? Finally for your information I use two probe measurements.
Any help will be much appreciated. Thank you!
- Keithley Applications
- Posts: 1262
- Joined: October 15th, 2010, 10:35 am
- Country: United States
Thank you for the feedback! I am aware of this document and actually this is what put me into thoughts about the capability of the equipment to measure inductances in the range of nH. However an inductance in the range of nH, at 1MHz, corresponds to a reactance X vector of approximately 10^-3. In that frequency the resistance vector R is approximately 10. Does this difference of 3 orders of magnitude make the measurement imposible?
Also do you know what could be the reason of the warning I receive?
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