Agilent Technologies EasyEXPERT Guia do Utilizador descarregar pdf (Página 134)

9-8 Agilent EasyEXPERT User’s Guide Vol. 2, Edition 1

If You Have a Problem

When You Perform Measurement

Voltage Measurement Error is Large

Voltage measurement error may be large because of the effects of the cable

resistance when forcing a large current.

To solve this problem:

• Use kelvin connections between SMUs and DUT. To cancel the effects of cable

resistance, connect the sense line as close as possible to the terminal of the DUT.

SMU Oscillates for High-Frequency Device

Measurements

When measuring parameters of high-frequency devices, such as GaAs MESFETs or

high-frequency bipolar transistors, oscillation may cause measurement problems.

Normal measurement cannot be performed because of oscillation.

To solve this problem:

• For FETs, add resistive ferrite beads as close as possible to the gate.

• For bipolar transistors, add resistive ferrite beads as close as possible to the base

or emitter.

• Make connection cables as short as possible. Long wires cause oscillation

because of their large inductance.

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Agilent Technologies EasyEXPERT Guia do Utilizador Página 134