Hello!
I'm using my scope 90404A to measure a pass band signal. The information is in the band 4.9-5.1 GHz. In fact, after the acqusition, I perfom a bass band filter in Matlab to remove all the information in other frequencies.
I'd like to use Infiniisim to remove the effect of an amplifier in mi acquired signal. However, I don't know if I should obtain the s2p parameter in all the bandwidth available in my ENA (in this case from 300 kHz up to 8.5 GHz) or I should obtain the s2p parameter in my band of interest 4.9-5.1 GHz.
Which would be the difference in using infiniisim in all the bandwidth of the scope (8 GHz) or in a selected narrower bandwidth? Would we commit any error in using only a passband correction?
Thank you in advance.
I'm using my scope 90404A to measure a pass band signal. The information is in the band 4.9-5.1 GHz. In fact, after the acqusition, I perfom a bass band filter in Matlab to remove all the information in other frequencies.
I'd like to use Infiniisim to remove the effect of an amplifier in mi acquired signal. However, I don't know if I should obtain the s2p parameter in all the bandwidth available in my ENA (in this case from 300 kHz up to 8.5 GHz) or I should obtain the s2p parameter in my band of interest 4.9-5.1 GHz.
Which would be the difference in using infiniisim in all the bandwidth of the scope (8 GHz) or in a selected narrower bandwidth? Would we commit any error in using only a passband correction?
Thank you in advance.
1) The signal that you are trying to capture is outside the bandwidth of your scope. The scope has BW from 0 to 4GHz, and your signal is from 4.9-5.1 GHz. Unless you are downconverting somehow, your won't see anything on the scope. Based on information farther down in your post, you may have either a 90804A, or your scope has been upgraded to 8GHz BW
2) InfiniiSim was designed to remove the effects of passive devices, and may not work with an active device. There may be intermodulation effects, etc, that InfiniiSim may not be able to account for.
3) You get the S-Parameters from 0 to >5.1GHz. You don't need to go all the way to 8GHz. If you stop at 5.5GHz, as an example, InfiniiSim will attempt to attenuate the higher frequencies, and you'll have less noise in your measurement.
4) There is no concept of 'passband' on the scope. It is a wideband instrument with very flat response from 0Hz to its bandwidth
AG