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Linearity Test with CW & Linear Sweep Type Mixture

Question asked by VNA123 on Mar 21, 2018
Latest reply on Mar 24, 2018 by Dr_joel

Hi guys,

 

I use a 4-port N5222A PNA with some rather standard options. I am measuring an active amplifier device and I would like to be able to do the following more or less.

 

 

Set Port1 to be emitting a single frequency with an arbitrary power level.

 

Route the port 1 test cable to the input of my active amplifier device.

 

The output of the amplifier goes to port 2 test cable and into port 2 of the PNA.

 

Measure the frequency spectrum of the receiver (dBm) at port 2.

 

Increase power level and watch for harmonics created due to saturation.

 

 

I've tried messing around to get this to happen and it appears to be more difficult than at first glance. I tried doing something like setting up two channels, one a CW type on port 1 and another a linear sweep at port2 (B receiver), but I can't get the operations to simultaneously conduct. It's been a long time since I've studied VNA architecture and so I've forgotten some basics which could help me decipher what to do or if this is possible with my given setup as it stands.

 

I could use an external piece of equipment to drive the amplifier, but I'd prefer the PNA since it has rather nice absolute source specs.

 

I hope I've presented this problem of mine clearly.

 

Any suggestions?

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