# Questions tagged [ebers-moll]

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### How do I calculate the currents and voltages in a circuit comprising of a transistor and resistors using a model like the Ebers-Moll model?

I wish to know how to calculate the voltages and the currents at each of the pins in a BJT using either Ebers-Moll or Gummel-Poon model For reference I have managed to obtain some important values ...
54 views

### T Model of a transistor

I want to redraw this circuit based om the T model. Is this T model representation correct? Where Zth is the parallel between R1 and R2 in series with C1, re = (Vt/Ie) Vt being the early voltage, Z2 ...
90 views

### Transistor current source \beta varies (AoE Ex. 2.23)

I am having trouble solving the following exercise: Exercise: If $\beta$ varies from 50 to 100 for collector voltages within the output compliance range, how much will the output current vary? (...
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### What part of Ebers-Moll equation shows the decrease of the collector current in saturation region

By looking at the Ebers-Moll equation for a BJT transistor: Is this formula explicitly showing why Ic starting to decrease towards zero in saturation region. Which part of the equation shows that?
74 views

### Reverse biased diode formula in Ebers-Moll model

As far as I understand in an PNP transistor the base voltage Vb is higher potential than the collector voltage. So since Vb>Vc the base collector junction is then reverse biased: But in Ebers-Moll ...
145 views

### Operation of BJT with low values of Vbe (“cutoff” region)

Many sources claim that when the base-emitter voltage becomes smaller than approximately 0.6V-0.7V, the bipolar junction transistor goes in the cutoff region and there is zero base and collector ...
In Ebers-Moll Equations for common emitter BJT the inverse saturation current $I_s$ appears as a parameter. What is the saturation current $I_s$ exactly and how should I measure in a common ...