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How to design a buffer?

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saleheen

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How do I design an unity buffer (non-inverting) using a transistor(2N3904) ? The input comes from an amplitude modulation circuit with carrier frequency of 40kHz. Therefore, the bandwidth should also be considered.
 

Only 1 transistor?? A simply emitter follower will fulfill the job, if you don't care the DC shift and a small gain loss.
 

What means "high" ? 1 MHz ? 100 MHz ?
Only one transistor allowed ? One or two power supplies with which value(s) ?
 

I think you need to detail your spec too. For one transistor and same power, emitter follower almost the highest bandwidth. :D
 

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