Manuals >Nonlinear Device Models Volume 2 >Using IC-CAP with an Agilent 85122A Precision Modeling System
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Terminating the Input Ports to Prevent Oscillation

Leave the network analyzer disconnected from the bias networks while you perform the DC measurements. Connect terminations with >20 dB return loss (such as 10 dB pads) to the RF IN connectors of the bias networks, to prevent possible bias oscillation. The network analyzer is calibrated later in the modeling procedures, immediately before the capacitance and S-parameter measurements.

Alternatively, isolate the device from RF power by manually setting 90 dB of attenuation at the network analyzer test ports. Also put the network analyzer in hold sweep mode by pressing STIMULUS > MENU > MORE > HOLD.

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