multistage common emitter amplifier

Thread Starter

Nabeel_mirza

Joined Jan 16, 2010
2
Hi

A friend has asked me to design a multistage (Three stage) common emitter amplifier for him with a total gain of 900.

The only info he has given me is as follows,

Total gain = 900
Re should be in the range of 1000 to 2000 ohms.....
Coupling capacitors should be in the range of 10microfarad..
BJT = NPN (2SC1815)

n thats it...

My question is "Is this info enough to design wht he asked for?". Coz i dnt think there is enough information.

Looking forward to a fanourable reply...
cheerzz

Please let me knw wt u people think or is it just me who is being a complete novice..
 

Thread Starter

Nabeel_mirza

Joined Jan 16, 2010
2
Exactly I told him the same thing bt he goes that this is only information he has n it could b designed..... as I knw the gain...... (Seriously no clue)

So is it safe to say that there is nt much information to design the amplifier.

Yes or No

Thank you
 

Ghar

Joined Mar 8, 2010
655
You could do for that gain but it won't necessarily end up useful. That's really the only spec listed.

You choose coupling capacitor values by specifying bandwidth... we can easily make the bandwidth poor and still use those values.
Resistor values come from input resistance requirements, bias currents, etc. Since he already called it 'Re' it implies he has some kind of design in mind, since without a schematic a resistor value is useless...
 
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