Agilent Technologies EasyEXPERT Guide de l'utilisateur télécharger pdf (Page 135)

Agilent EasyEXPERT User’s Guide Vol. 2, Edition 1 9-9

If You Have a Problem

When You Perform Measurement

SMU Oscillates for Negative Resistance Measurements

If the DUT has negative resistance characteristics, SMUs may oscillate. Because the

positive feedback may be configured by the DUT and the SMUs.

To solve this problem:

• For voltage controlled negative resistance device

• Connect G in parallel with your DUT to cancel negative resistance. To

obtain an output I-V curve, use the following equation.

IY = I - G  V

• For current controlled negative resistance device

• Connect R in series with your DUT to cancel negative resistance. To obtain

an output I-V curve, use the following equation.

VZ = V - R  I

• If the resistance of the DUT is less than 1 M, you can use a series resistor

built into the SMU.

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Agilent Technologies EasyEXPERT Guide de l'utilisateur Page 135