Now let’s look at the same BJT stage wherein we apply the negative feedback simply by means of emitter degeneration. This is a very important case because emitter degeneration is seen as benign by the no-feedback camp, and is given special dispensation by them. Most so-called no-feedback amplifiers depend extensively on the linearizing properties of emitter degeneration.
Remarkably, the curves look very much like those in the last post! But why should we be surprised, after all? The theory is the theory. Nevertheless, even I was surprised by this result. The application of negative feedback, even by means of benign emitter degeneration increases the production of high-order distortions. So if this Baxendall phenomena is making NFB bad, then the so-called no-NFB designs are suffering from it just as well!
