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Thanks for your replies.
I know the measured iip3 is the correct result, and the gain attenuated by the mismatch of the output balun. The problem is that how can I get a perfect iip3 figure with the correct power gain? Or I just need to explain the figure?
iip3 measurement
I designed a differential LNA with the output resistance about 400 ohm, When I measure the IIP3, I used a balun (1:4) to transfer the differential signal to single-ended, then connectted to the 50 ohm equipment. However, because the output resistance does not matching, the...
Hi, everyone. I designed a differential wideband(50MHz-1GHz) LNA with 75 ohm input impedance, and there are several problems about how to measure it:
1. The input impedance match to 50 hom test machine: Which is the best way? Should I adopt a resistor matching network? Or are there some better...
IIP3 measurement
Maybe I didn't explain clearly.
Actually, I used a spectrum analyzer. And gained the fundamental and 3rd harmonic power from the output spectrum. While the fundamental power minus input power (setting in the signal generator) is 3dBm less than the voltage gain.
IIP3 measurement
Thanks.
But I found that the difference of foundamental power to input power setting is 3dBm less than the voltage gain measured. So should the input power minus 3dBm when I plot the IP3 extrapolation figure?
iip3 measurement
When I measure IIP3 of an LNA, Agilent E4437B signal generator was used to generate two adjacent input signals. The question is, does the AMPLITUDE windows tell the sum of two-tone signals power or each one of them?
Thanks.
I added a "netlist include"compent, and set the "model library file" to the .net file. Then change the MOS devies model name to the model name according the file. But it report the following error:
Simulation / Synthesis Messages
Error detected by HPEESOFSIM during netlist parsing...
I got a .net model file, and want to simulater my schematic in @ds. How to use it?
Somebody tell me to import the file. While after import, I got a schematic with all the devices array in it, but all the devices have no model parameters. I copy one to my schematic and simulate, @ds report error...
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