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Design >> Analog Design >> Group delay
https://designers-guide.org/forum/YaBB.pl?num=1325441583

Message started by raja.cedt on Jan 1^st, 2012, 10:13am

Title: Group delay
Post by raja.cedt on Jan 1^st, 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.

Title: Re: Group delay
Post by rfidea on Jan 1^st, 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

Title: Re: Group delay
Post by raja.cedt on Jan 1^st, 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.

Title: Re: Group delay
Post by ywguo on Jan 2^nd, 2012, 8:25am

http://en.wikipedia.org/wiki/Group_delay
What is peaking amplifier?

Title: Re: Group delay
Post by loose-electron on Jan 2^nd, 2012, 12:57pm

Is there any reason it would not be the sum of the delays?

None that I can think of.