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Dennis Feucht

2-Port Analyzers on a Chip? Part 4: Voltage- & Current-Sense Interaction

Dennis Feucht
etnapowers
etnapowers
7/7/2014 3:38:16 AM
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Master
Re: voltage divider ratio
@DaeJ , you're correct, the criteria for compensation sensitivity should be clear to the analog engineer as well as the most important parameters that regulate the sensitivity. An equation might help a lot.

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etnapowers
etnapowers
7/7/2014 3:32:19 AM
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Master
Re: voltage divider ratio
Compensation sensitivity is really a important parameter, it would be desirable for a given instrument to have a equation that expresses this parameter in terms of the compensation components.

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DaeJ
DaeJ
7/5/2014 12:10:01 AM
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Re: voltage divider ratio
I think that high sensitivity might have more interference for other component than low sensitivity. Analog engineer needs to know the baseline of criterion for compensation sensitivity.  

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D Feucht
D Feucht
7/2/2014 11:26:43 PM
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Re: voltage divider ratio
"The voltage divider ratio T has to be precise to ensure the effectiveness of the VSN compensation, hence the resistors R1 and R2 have to be properly matched."

Yes, and it is also true for ISN compensation because both schemes depend on adding or subtracting an error quantity from the other's measurement circuit output.

"The choice depends on what is the best case in terms of error compensation. The more the compensation will be effective the more the option will be attractive."

Right, and the best choice might be made based on compesnation sensitivity which depends on scaling. Voltage is usually measured with less resolution than current in curve tracers, though for SMUs of today, that need not necessarily be the case.

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etnapowers
etnapowers
7/2/2014 12:08:28 PM
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Master
voltage divider ratio
The voltage divider ratio T has to be precise to ensure the effectiveness of the VSN compensation, hence the resistors R1 and R2 have to be properly matched.

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etnapowers
etnapowers
7/2/2014 11:34:37 AM
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Master
design choice
"This situation gives us a design choice. We can either correct for an error current in the ISN or an error voltage across the VSN input."

 

The choice depends on what is the best case in terms of error compensation. The more the compensation will be effective the more the option will be attractive.

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