6BX7-GT – SPICE verification and validation

6BX7-GT – Parity plot between the analytical model and the SPICE model

ALT: Parity plot between analytical prediction and SPICE model prediction for the 6BX7-GT

Caption: Parity plot of the 6BX7-GT SPICE verification. Each point compares the analytical model prediction with the SPICE subcircuit prediction; the diagonal represents ideal agreement.

Description:

Direct comparison between the plate current predicted by the analytical 6BX7-GT model and the current produced by the SPICE subcircuit derived from the same formulation. The close alignment of the points with the diagonal shows that the SPICE translation faithfully reproduces the analytical law.

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6BX7-GT – Direct comparison between the analytical model and the SPICE model

ALT: Direct comparison between analytical-model curves and SPICE-model curves for the 6BX7-GT

Caption: Comparison between the analytical model and the 6BX7-GT SPICE subcircuit for a representative set of plate-characteristic curves. The two responses are practically superimposed.

Description:

Overlay between the curves generated by the analytical 6BX7-GT model and those produced by the SPICE model translated from the same law. The graph shows that the subcircuit reproduces the analytical plate-characteristic behavior with essentially complete agreement.

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6BX7-GT – Residuals of the SPICE verification

ALT: Residuals between the SPICE model and the analytical model of the 6BX7-GT

Caption: Residuals of the 6BX7-GT SPICE verification. Differences between the SPICE subcircuit and the analytical model are at the level of numerical precision.

Description:

Residual plot obtained by comparing the 6BX7-GT SPICE model with the corresponding analytical formulation. The very small error scale highlights that the SPICE conversion introduces no significant discrepancy relative to the analytical model.

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6BX7-GT – Independent-validation domain map

ALT: Independent validation points of the 6BX7-GT classified against the fitting domain in the Va-Vg plane

Caption: Map of the independent-validation points in the Va–Vg plane. The blue boundary represents the model training domain; points are classified as in-domain or out-of-domain.

Description:

Classification plot of the 6BX7-GT independent-validation points relative to the domain defined by the fitting data. The figure clearly distinguishes between interpolation conditions and extrapolation conditions for the model.

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6BX7-GT – Independent validation of the SPICE model

ALT: Comparison between digitized General Electric datasheet data and the SPICE model in the independent validation of the 6BX7-GT

Caption: Independent validation of the 6BX7-GT. Data digitized from the GE datasheet are compared with the SPICE model and the corresponding analytical model; the plotted points lie within the model domain.

Description:

Comparison between independent data digitized from the General Electric 6BX7-GT datasheet and the response of the SPICE model with frozen parameters. The graph shows that the SPICE subcircuit reproduces the same response as the analytical model during validation on curves not used in fitting.

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6BX7-GT – Residuals of the independent SPICE validation

ALT: Residuals between the SPICE model and digitized GE datasheet data in the independent validation of the 6BX7-GT

Caption: Residuals of the independent validation of the 6BX7-GT. The graph shows the difference between the SPICE model and the data digitized from the GE datasheet, distinguishing the behavior across the different curve families.

Description:

Residual plot obtained by comparing the 6BX7-GT SPICE model with the independent validation data digitized from the General Electric datasheet. It is useful for observing how the error is distributed along the different curves and for highlighting any systematic variation across the considered grid-voltage conditions.

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