#RIGOL DSA815 MANUAL PDF FULL#
With the noise floor as the slightly lower-intensity saved trace, sweeping the full lower band, 0-2.9GHz, ref level 0dbm, everything else "auto": First picture I input 1.95535 GHz at 0dBm. Thanks for the idea, tried this out with my HP 8562A. I believe that the job of the lumped LPF just before it is to filter away these high frequency re entry modes. If the first IF is 5GHz then where is the 5GHz IF1 filter in any of the teardown images? Note that the big (2GHz?) IF1 hairpin filter will have a re-entry mode up at around 4 or 5GHz where it will look like a 5GHz BPF but it would be lossy and probably have lots of ripple and a poor match. This suggests a ballpark of 2GHz for the first IF if you assume a sensible dielectric constant for the PCB material. to support just the frequency range of the 815 model) then this first LO would only have to run up to approx 3.5GHz and the artwork for the first LO LPF seems to agree with this? The total metal length in the resonators in the hairpin filter used in the first IF is about 1.5 inches. Also the artwork for the printed LPF for the first LO would have to support >8GHz operation but the physical dimensions suggest <4GHz here. But if you look at the artwork for the three VCOs the highest frequency VCO only looks like a design that would run up to (maybe) 4GHz.
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If it had a 5GHz first IF and supported both the 1.5GHz and >3GHz variants the first LO would have to run from 5 GHz to over 8GHz.