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[SOLVED] What is the value of "beta" and "A" for a CS with degeneration resistance Rs?

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iVenky

iVenky

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What is the value of "beta" and "A" for a CS with degeneration resistance Rs?

I have a CS amplifier. I need to know the value of gain with feedback. For that I need to know the values of A and 'beta' in the feedback gain formula. What are those values?


Thanks in advance.
 

Re: What is the value of "beta" and "A" for a CS with degeneration resistance Rs?

Hello my friend
A is the amplifier gain without feedback and beta is your feedback network gain.
Best Wishes
Goldsmith
 

Re: What is the value of "beta" and "A" for a CS with degeneration resistance Rs?

iVenky said:
I have a CS amplifier. I need to know the value of gain with feedback. For that I need to know the values of A and 'beta' in the feedback gain formula. What are those values?
Thanks in advance.
Click to expand...

Look at the pdf attachement.
It applies to a BJT amplifier - however, you easily can transfer it to a FET circuit.
 

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  • Common_Emitter.pdf
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Re: What is the value of "beta" and "A" for a CS with degeneration resistance Rs?

goldsmith said:
Hello my friend
A is the amplifier gain without feedback and beta is your feedback network gain.
Best Wishes
Goldsmith
Click to expand...
I know their meanings. I just need their values for a CS.
 

Re: What is the value of "beta" and "A" for a CS with degeneration resistance Rs?

Again HI
Ok as i understood , you want design them for a CS amplifier ? if yes , it depends on the value of the components of your amplifier . at degenerative feedbacks ( negative ) the feed back will reduce the gain and increase the BW . so it is important to know , that how much gain do you need with feed back?
Best Wishes
Goldsmith
 

Re: What is the value of "beta" and "A" for a CS with degeneration resistance Rs?

goldsmith said:
Again HI
Ok as i understood , you want design them for a CS amplifier ? if yes , it depends on the value of the components of your amplifier . at degenerative feedbacks ( negative ) the feed back will reduce the gain and increase the BW . so it is important to know , that how much gain do you need with feed back?
Best Wishes
Goldsmith
Click to expand...

I need the formula for beta for a CS NMOS with degenerative resistance Rs. Note that Drain is connected to the supply and there's no load at all . That is what I have been asking from the first.
 

Re: What is the value of "beta" and "A" for a CS with degeneration resistance Rs?

Dear iVenky
See the Literature that "LvW" attached it . it can help you clearly.
Good luck
Goldsmith
 

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