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Group delay (Read 857 times)
raja.cedt
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Group delay
Jan 01st, 2012, 10:13am  
hello,
can any one please tell me how group delay of cascaded system will be? I have 4 cascaded broadband amplifiers and i know each stage group delay under proper loading, so what is the overall  Group delay.

Any kind of reference will be appreciated

Thanks,
Raj.
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rfidea
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Re: Group delay
Reply #1 - Jan 1st, 2012, 12:15pm  
It must be the sum of each block! Use the fact that the argument of a complex product is the sum of the arguments

Tg = -d(arg(Gtot)) / dw = -d(arg(G1*G2)) / dw =
   = -d(arg(G1)+arg(G2)) / dw = - d/arg(G1)/dw - d/arg(G2)/dw
  = Tg1 + Tg2
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raja.cedt
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Re: Group delay
Reply #2 - Jan 1st, 2012, 12:37pm  
hello,
thanks you. I forgot about this. Do you have reference based on group delay, i want to improve group delay of my peaking amplifier source capacitive degeneration .

Thanks,
Raj.
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ywguo
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Re: Group delay
Reply #3 - Jan 2nd, 2012, 8:25am  
http://en.wikipedia.org/wiki/Group_delay
What is peaking amplifier?
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Re: Group delay
Reply #4 - Jan 2nd, 2012, 12:57pm  
Is there any reason it would not be the sum of the delays?

None that I can think of.
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