Peak in the frequency response of the amplifier

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kahroba92

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peak in frequency response of amplifier

Hi,

I have designed an amplifier in CMOS technology which has inductive peaking technique in active form for extending its bandwidth.

In frequency response simulation, before 3-dB frequency, the amplifier has about 1 dB peak.

How should I understand about the allowable value of peak … is that different for various applications?

How should I report the amount of gain? The dc value or with peak (1 dB larger)?

I have to sweep the gain with one of the parameter in the amplifier, and I don’t know sweep the dc gain or the gain with peak value.


Thank you.
 

Re: peak in frequency response of amplifier

Peaking means creating a zero on TF.Here, the main consideration is the stability of the amplifier.
in order to do that, Phase and Gain Margin specs. should carefully be examined.Poe-Zero positions must be checked.
 
Re: peak in frequency response of amplifier

thanks for your answer.

I have written the transfer function and pole-zero are located in LHP.

my amplifier is a VGA (variable gain amplifier). in a paper that I have read before, said that 1 dB peak in allowable.

is there any special reason for this 1 dB?
 

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