DDS with AGC?

shurp on Dec 8, 2021

Hey, I want to know if there is a way to create a constant amplitude as the frequency increases for a DDS output. Not sure whether I should be looking for Automatic level control or Automatic Gain control.

Can I put AGC or ALC in series with DDS to create a constant amplitude? Would be interested in knowing if there is already something similar created for a DDS system to output a constant voltage amplitude.

I hope to hear your response.

Thank you

Extra info
[edited by: shurp at 6:13 AM (GMT -5) on 8 Dec 2021]

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KennyG
Dec 13, 2021 in reply to shurp +1 verified
The AD9910 and AD9857 have a built-in (selectable) inverse sinc filter that automatically compensates for the frequency dependent amplitude roll off of the DAC.

0 mcee

on Dec 13, 2021 1:05 AM
Hi,

This application note (AN-1507: Stable, Closed-Loop, Automatic Power Control for RF Applications) might be of help for the output that you would like to obtain.

Best regards,

Mark
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0 shurp on Dec 13, 2021 1:54 AM in reply to mcee

Been waiting for someone to respond; thank you. Looked into ADL5330, it seems that it operate from 10Mhz to 3Ghz.

I am working with a signal that operates from 100Khz to 500Khz. Is there any AGC IC that can assist with this frequency?
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+1 KennyG

on Dec 13, 2021 2:53 PM in reply to shurp
The AD9910 and AD9857 have a built-in (selectable) inverse sinc filter that automatically compensates for the frequency dependent amplitude roll off of the DAC.
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0 shurp on Jan 22, 2022 8:41 PM in reply to KennyG

I have decided to use a separate AGC, AD8367 but if I need to use a DDS with internal compensation, I will used AD9910. Thank you
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