[Help] BJT diff amp - good CMPP, perfect balance etc..

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TanTeckSiang

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why need a good cmrr bjt

Hi all,

I have some question on bjt diff amp.
1.What is defined as a good CMRR
2. How can perfect balance diff amp be achieved
3. What parameters affect it

Thanks for helping
 

bjt bangalore bjt bjt

at 60 Hz a CMRR of 120db is considered good

an ideal differnial amplifier produce an out put voltage propotional to he difference between the input votages
 

bjt amp*

I am using a Class AB sub-circuit as the output stage for an Op Amp. How to bias this stage such that I can drive a peak current of 25mA and also have a low output impedence.
 

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