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Can I get internal diagram of VGA in AD8331?

Question asked by jebaspaul on Sep 5, 2012
Latest reply on Sep 20, 2012 by prb

Hi,

 

We are using AD8331 LNA in our design. While analysing VGA part, we are not getting enogh idea from datasheet provided.

My confusions are;

 

VGA consist of attenuator and one amplifier. The gain mentioned for this Amplifier is 21dB. Is this gain is in open loop or in closed loop.

And also, Is the post amplifier present inside this AD8331 IC is also in closed loop.

 

Can anybody clarify this for me?

 

 

Thanks,

Jebas

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