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1. Using InfiniiMax III Series Probes
SPICE Models for N2838A and N2836A Probe Heads
SPICE Models for N2838A and N2836A Probe Heads
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These are SPICE models for the input impedances of the various InfiniiMax
III probes. Generic SPICE sub-circuit files are listed so they can be copied
and pasted into user's SPICE simulations.
Chapter
6, "Performance Plots" shows the matching between the
measured input impedance and these modeled input impedances for the
various probe heads.
The following diagram shows the SPICE circuit used for these probe
heads:
• N2838A 25 GHz PC Board ZIF Tip (with N5439A ZIF Probe Head)
• N2836A 26 GHz Solder-In Probe Head
Figure 9
SPICE circuit to use for N2838A and N2836A probe heads
The input impedance is only a function of the probe head; the amplifier
input does not significantly affect the input impedance.
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