Hi,
I'm trying to find out the voltage gain and the input/output impedances for such a common emitter amplifier.
My resulting expression is something like Av=hfe*RE/(hie+RE)
hie is the base emitter resistance calculated from the formulas on paper.gm is an approximation for a collector current of 1mA(static operating point).Iset current source is also 1mA.I considered that the Vout is equal to the Collector current(Ib*hfe where Ib is also known ....1uA) times the RE resistance(Ib is small so i got rid of it).
The load current Irl =Ib*hfeIset.?
Any idea about solving this?
I expect Zout (output impedance ) to depend mainly on RE.Is this true?
Input one i'm pretty sure is gonna be hie + RE.
Thx.
I'm trying to find out the voltage gain and the input/output impedances for such a common emitter amplifier.
My resulting expression is something like Av=hfe*RE/(hie+RE)
hie is the base emitter resistance calculated from the formulas on paper.gm is an approximation for a collector current of 1mA(static operating point).Iset current source is also 1mA.I considered that the Vout is equal to the Collector current(Ib*hfe where Ib is also known ....1uA) times the RE resistance(Ib is small so i got rid of it).
The load current Irl =Ib*hfeIset.?
Any idea about solving this?
I expect Zout (output impedance ) to depend mainly on RE.Is this true?
Input one i'm pretty sure is gonna be hie + RE.
Thx.
Attachments

79.4 KB Views: 21