Thanks for your comment. Does this reflect something in the resource I have written, or is it a general observation?

For my opinion - both (as well as).

In your contribution you are referring to Horowitz/Hill page 64. But one should consider that on page 62 the authors speak about a "very simple introductory transistor

**model" **only.

(Comment: A model does not necessarily reflect the main physical properties; it is the only task of a model to work properly).

More than that, on page 79 we can read: "Clearly, our transistor model is incomplete and needs to be modified" ..."the transconductance model will be accurate enough for the remainder of the book". (As you know, the transconductance model is based on voltage control). Hence, we can conclude that this model is in accordance with physical realities.

May I add one comment? It is funny, however, everybody who claims to use a "current-control model" during the design steps is in error. That means: He believes to use the current-control feature but, in fact, he doesn`t.

Let me explain:

__Everybody__ designs a BJT stage based on a certain base-emitter voltage to safely open the BJT to allow a DC current Ic. Is this current-control? Of course, not.

More than that, for calculating the base bias circuitry we, of course, take into account the fact that there is a current Ib (loaded voltage divider principle) - but has this approach anything to do with

**control**?

__Therefore, my question__: At which stage of the design process some calculations are based on a current-control feature? More than that, to what extent a current-controlled model would simplify calculations (as claimed by many defenders of this model)?