Answer by LvW for Is the hybrid-pi parameter hie really equivalent to...
Here is my comment to the "re-model":There are two important BJT characteristics: (1)Ic=f(Vbe) . This is Shockleys fundamental exponential relation. For gain calculation, the SLOPE of this function is...
View ArticleAnswer by G36 for Is the hybrid-pi parameter hie really equivalent to...
To be more precise the \$h_{ie}\$ is not strictly equivalent to \$(\beta+1)r_e\$. \$h_{ie}\$ also known as \$h_{11}\$ comes directly from a two-port network theory. Where they treat the transistor as a...
View ArticleAnswer by Tony Stewart EE75 for Is the hybrid-pi parameter hie really...
\$Hybrid~ Model\$more complex\$h_{ie}=\dfrac{\delta V_{BE}}{\delta I_B} @Q_{point}\$ This is the small signal input impedance. This is a product of the dynamic current gain and many variables....
View ArticleIs the hybrid-pi parameter hie really equivalent to (beta+1)*re?
I'm reading a book on feedback amplifiers at the moment and it makes comprehensive use of a simplified hybrid-pi model. A parameter that keeps popping up is hie and I've always considered this to be...
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