I'm looking for the derivation of the formula for the stability factor (s'' or s(beta)) of BJT bias circuits, particularly the ones with emitter resistance. The book I'm using says that the derivation is too complex and so they didn't include it. I tried to derive it myself but I can't get the same result. Does anyone know where I can find the derivation? I tried googling, but the sources I found say the same thing as my book.

I'm looking for the derivation of the formula for the stability factor (\$S''\$ or \$S(\beta)\$) of BJT bias circuits, particularly the ones with emitter resistance. The book I'm using says that the derivation is too complex and so they didn't include it. I tried to derive it myself but I can't get the same result. Does anyone know where I can find the derivation? I tried googling, but the sources I found say the same thing as my book.

I'm looking for the derivation of the formula for the stability factor (s'' or s(beta)) of BJT bias circuits, particularly the ones with emitter transistors. The book I'm using says that the derivation is too complex and so they didn't include it. I tried to derive it myself but I can't get the same result. Does anyone know where I can find the derivation? I tried googling, but the sources I found say the same thing as my book.

I'm looking for the derivation of the formula for the stability factor (s'' or s(beta)) of BJT bias circuits, particularly the ones with emitter resistance. The book I'm using says that the derivation is too complex and so they didn't include it. I tried to derive it myself but I can't get the same result. Does anyone know where I can find the derivation? I tried googling, but the sources I found say the same thing as my book.