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> Perfomance comparison in CE,CC,CB amplifier, in midband frequencies
jasonkwk
Posted: April 20, 2006 04:45 pm
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I am new here, nice to meet all of you smile.gif

I have a few question to ask here, hope you all can help me in this:

1) what are the performance u can compare betweent th three types of BJT amp.

2) how to find the midband gain generally sad.gif
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lfccraig
Posted: April 20, 2006 05:05 pm
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dont really know what youre trying to ask. to find the midband gain you draw a small signal equivalent and then find Vo/Vi. its different for each type of amp!!

as for comparisons, waht do you mean? all these types of amp are different in a certain way. eg you can use a common base with a common emitter to make a cascode and decrease the Miller effect. but i think all of them give pretty much the same result (gain) if you set them up correctly (bias them correctly)!!!

Craig
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jasonkwk
Posted: April 20, 2006 05:16 pm
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thanks for answering my second question

let me rephrase:
using the same RB, RL,RC and the same C1,C2,C3 for the three different type BJT amp configuration.
compare the peformance of the 3 circuit at midband frequencies.

i wonder the performance comparison, does it means voltage gain or current gain?
is it their gain is almos the same for 3 types of BJT configuration
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Geek
Posted: April 20, 2006 06:39 pm
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I smell homework rolleyes.gif

CE = Voltage gain with current gain. Best compromise.
CB = Voltage gain without current gain (current gain is about 0.91 to 0.98). High output impedance (good for RF tuned circuits), low input impedance.
CC = Current gain without voltage gain (voltage gain is about 0.91 to 0.98). High input impedance, low output impedance. Great for buffers and linedrivers.


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