The input & output impedance of an amplifier

[pateldivyesh68@gmail.com]

WHAT IS THE input & output impedance of the AMPLIFIER...?
Rin>Rout
OR
RIn<Rout
is it varies form amplifier to amplifier....?

 

[keremcant]

Re: related to amplifier

depend on the type of the amplifier.
for a generic op-amp ideally Rin = infinite and Rout = 0. In real life, the input impedance is indeed very high, however the output impedance is not zero.

 

[tony_lth]

Re: related to amplifier

For microwave amplifier, most are matched to 50 ohms for both input and output.

 

[pateldivyesh68@gmail.com]

For Common emitter amplifier....if Rin is high(INFINITE) then how the base will be conduct?....Ib=0....then how the amplifier will work?

 

[LvW]

For Common emitter amplifier....if Rin is high(INFINITE) then how the base will be conduct?....Ib=0....then how the amplifier will work?

Rin never will be infinite. Always Ib>0 !
Besides this, you have to discriminate between static and dynamic input impedance.