Spice Models For N5440/1/4/5/7A Probe Heads - Keysight N2800A User Manual

8
SPICE Models

SPICE Models for N5440/1/4/5/7A Probe Heads

The SPICE models in this section are 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
impedance and these modeled input impedances for the various probe heads.
Figure 73
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The input impedance is only a function of the probe head; the amplifier input does not
significantly affect the input impedance.
You'll find the following SPICE data on the documentation CD that was shipped with your probe.
N OT E
Copying this data from the CD is the simplest most reliable method to get the data.
130
7, "Performance Plots" shows the matching between the measured input
on page 131 shows the SPICE circuit used for these probe heads:
N5440A 28 GHz ceramic ZIF Tips (with N5439A ZIF Probe Head)
N5447A 28 GHz ceramic high-sensitivity ZIF Tips (with N5439A ZIF Probe Head)
N5441A 16 GHz solder-in probe head
N5445A browser probe head
N5444A SMA probe head
InfiniiMax III Series Probes User's Guide