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ADL5801 issue of IF output

Question asked by starraytheon on Jun 14, 2014
Latest reply on Jun 23, 2014 by bkamak

Hi Experts,

 

I have a question in ADL5801 application.

 

I have attached the sch for details.

 

My goal is that it gets 0dBm IF signal at 1.8G Hz.

 

The RF signal is -1dBm at 2.59G Hz.

 

The LO signal is from -12dBm to -1dBm.

 

The IF output is -13dBm constant behind the balun.

 

Changed Vset from 2.2V to 4.3V, and disconnect DETO, IF output has never been changed.

 

IFop and IFon Diff output is -11dBm.

 

In my opinion, RF is -1dBm, the IF will be -1dBm too.

 

Can the Mixer core bias current effect the IF output strength?

 

Or onchip LNA for LO is saturation? Or the matching issue in the peripheral circuits?

 

Hope to get your guide soon, thanks a lot!

 

 

B&R

Tom

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