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Numerical derivation of IV curve is always a possibility to deduce dI/dV graph. How to measure it directly in voltage bias mode? What concept is required for it? What instrument are required to measure dI/dV?

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    \$\begingroup\$ dI/dV of what? A transistor? \$\endgroup\$ – Transistor Jul 17 at 17:35
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There's many ways to measure it.

I assume you're interested in the differential resistance of a two-terminal device, or of a port on an n-port device.

You could use a semiconductor parameter analyzer to sweep voltage or current and measure the response, then take a numerical derivative.

You could use a function generator (possibly with a circuit to bias the device to the interesting operating point) to apply a sinusoidal voltage, and measure the current response.

You could use a vector network analyzer to measure the RF reflection coefficient at a particular bias point and determine the resistance from that.

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  • \$\begingroup\$ Yeah Thanks for the asnswer. I am interested in second one. I am really novice in circuit design and I'm sorry. I have a Lock-in as sinusoidal Voltage source, DC Current source and Multimeter. Can you please help me how to make it functional. How can I design the circuit? What concept it uses? Any other instument is required for it? \$\endgroup\$ – Gregarious Soul Jul 18 at 8:30
  • \$\begingroup\$ @Greg, if you have more questions you should post them as new questions. \$\endgroup\$ – The Photon Jul 18 at 14:18

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