Visualising the common-base transistor Hybrid-Pi model with QUCS-S and ngspice

In this one we look at the common-base spice model and show the miller-effect on current gain.

This shows the common-base hybrid-pi model with the collector-base capacitance disabled:-

this is pretty close to the prediction made here for alpha $\alpha$:-

for a common-base amplifier:-

\[\alpha = \frac{\beta}{(\beta + 1)}\]

Here we enable the collector-base (Ccb) capacitance:-