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LNA+lowIF mixer sim(PSS+PAC)&(PSS+PXF), strange voltgain

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wccheng

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pxf mixer simulation

Dear all,

I design a LNA + low IF mixer. I have combined them and do the voltage gain simulation using spectreRF. I use PSS + PAC to get the voltage gain result. However, it gives out a strange result. Actually, I need to set the RF input port PAC Magnitude in a certain value for simulation. If I give different magnitude, the voltage gain is different. I don't know why but the curve shape is same. Do I set something wrong? Could any expert tell me?

If I use PSS+PXF, it would give the same voltage gain result whatever I set the input power level. So Strange!!

Which one I should use?

thanks

wccheng
 

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