Input Impedance SPICE Models for InfiniiMax 1130 Series 3.5GHz to 7GHz Active Probes This document contains SPICE models that can be used to predict the probe loading effects of the InfiniiMax active probes. Important points about these SPICE models are:
SPICE models shown here are currently only for input impedance which allows modeling of the
probe loading effects. Probe transfer function is generally flat to the specified BW. Transfer function SPICE models may be added later if demand is sufficient.
These input impedance is a function of the probe head type only. The probe amp bandwidth (3.5GHz 1131A, 5GHz 1132A, or 7GHz 1134A) does not have any effect on the input impedance of the probe heads.
Five configurations are covered here: •
Differential Browser Probe Head (E2675A)
•
Differential Socket Tip Probe Head (E2678A)
•
Differential Solder-In Probe Head (E2677A) (Full BW 100ohm resistors)
•
Single-Ended Browser Probe Head (E2676A)
•
Single-Ended Solder-In Probe Head (E2679A) (Full BW 100ohm resistor)
If damped wire accessories or longer mid-BW resistors (for solder-in probe heads) are used, they can be modeled by adding an RLC model in front of the appropriate probe head model and zeroing out the damping resistor in the probe head model. There is one SPICE schematic for the differential probe heads and one SPICE schematic for the singleended probe heads. The schematics have parameterized R, L, and C values that are given in the SPICE deck for the specific probe head. Additionally, an input impedance plot is given that shows the matching of the measured data to the modeled data. Matching is generally very good up to the specified BW of the probe head with the 7GHz probe amp.
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