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The simulation approach is similar to the one used in [61] for High
Electron Mobility Transistors (HEMTs). In two independent simulations with
MINIMOS-NT small-signal voltages are applied to the device terminals. The
intrinsic Y-parameters are extracted from the results as shown in
[200]. A frequency of 5 GHz at which the measured data was extracted
is chosen for the simulation to avoid dispersion effects in a lower frequency
range. The intrinsic Y-parameters are converted to Z-parameters and from those
the intrinsic small-signal elements are calculated. A T-like eight-element
small-signal equivalent circuit model
[201] as shown in Fig. 4.23 is used. The Ohmic resistances are
completely accounted for in the simulation. The S-parameter
calculation uses the same typical values for the extrinsic parasitic elements
(inductances and capacities) as extracted from the underlying technology
[202] for compact modeling. From this set of parameters extrinsic
S-parameters are calculated for the frequency range of 0 to 20 GHz suitable for
comparison to the measurements in the same frequency range.
Vassil Palankovski
2001-02-28