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SMU Source Impedance?

Question asked by steveor on Jun 24, 2011
Latest reply on Jun 30, 2011 by nakanok

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Hi,

I'm using the 41421B Source Meter Unit in voltage mode. What is the source impedance (especially reactance) ?

When I use the force and sense connections, the sense is used to correct the forcing voltage. How does this change the source impedance? What is the speed of the correction? Can this be used to correct 10 ns ripples?

Thanks,
Steve

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MattC Jun 27, 2011 7:25 AM
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Hi,

Can you check on the model number? I cannot find that model number on our website.
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steveor Jun 27, 2011 7:57 AM
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Matt,

It's an old HP plug-in to the 4142B 8 slot SMU mainframe. It's long obsolete, but my questions are more generic, "What is the source impedance of a SMU?", and "How does the force/sense leveling loop affect source impedance?"

Thanks,
Steve Ortiz
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nakanok Jun 30, 2011 9:37 PM
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Hi,
The output impedance of SMU is typically 0.2ohm at non-kelvin connection.
Normally, the DUT and cable impedance will be added.

If you use the kelvin connection (4-wire or force and sense connection), since the sence impedance is very high, the output impedance is less than 0.001 ohm (becomes very small).

Best regards,
Keisuke Nakano
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