Ac coupled Amplifier question

Thread Starter

Panterulez

Joined Mar 25, 2009
7


According to my notes, it is stated the CC amplifier, an emitter-follower gives low output resistance and buffers the high gain stage from the relatively load resistance. I just don't seem to understand what this exactly means ? Can anyone enlighten me
 

The Electrician

Joined Oct 9, 2007
2,971
The load is 250 Ω. If it had been connected to the collector of the C-E amplifier (through C5), then the effective collector load resistance would have been 4700 Ω in parallel with 250 Ω, and the gain of the C-E stage would have been drastically reduced.

The emitter follower has a low output resistance to drive the low resistance load, and a high input impedance to avoid loading the C-E stage.
 
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