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Model 4225-RPM and Model 4225-RPM-LR Remote Pulse Module Instructions
Figure 8: VDS-IDS curves for a MOSFET showing the load-line effect at high currents
The 4225-RPM has resistance in series with its output (typically between 20 Ω and 50 Ω). It also exhibits the
load-line effect.
The 4225-RPM-LR also has resistance when placed in series with its output, but this is typically between 2 Ω
and 3 Ω (not including cable resistance). It also exhibits the load-line effect, but to a much lesser degree than
the 4225-RPM.
The following figure compares the load-line effect of the 4225-RPM and the 4225-RPM-LR. In the figure, the
measured device under test (DUT) is the SD210. The blue curves are the device measured with the
4225-RPM, while the green curves are the same device measured with the 4225-RPM-LR. Note that the
load-line effect is sharply reduced for the 4225-RPM-LR; the load-line effect corresponds to a little over 2 Ω of
resistance.
PA-1086 Rev. A October 2020
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