Common source

Common source amplifier

Inherent voltage gain:

${(1+\beta _{0})(R_{E}||R_{load}) \over r_{\pi }+(1+\beta _{0})(R_{E}||R_{load})}$

Input resistance:

$R_{1}||R_{2}||(r_{\pi }+(1+\beta _{0})(R_{E}||R_{load}))$

Current gain:

$A_{vm}{r_{in} \over R_{load}}$

Output resistance:

$R_{E}||{r_{\pi }+R_{1}||R_{2}||R_{source} \over 1+\beta _{0}}$

Transistor amplifiers

• Common emitter
• Common collector
• Common base
• Common source
• Common drain
• Common gate