I am simulating a direct conversion receiver and I am interested in simulating the noise at baseband. The problem is that I get different results when using hbnoise with sweep-type relative harmonic=0 and absolute to sweep through the baseband bandwidth. Shouldn't it be identical as eventually the swept bandwidth is the same for both cases. Thanks in advance.
I delayed my reply until I did further investigations. First, The above error disappeared and I couldn't reproduce it. It disappeared after creating new maestro veiw!
Regarding your reply, I did noise sim "ALL" not "USB", as I was simulating phase noise simultaneously for other nodes (LO signal of a receiver) together with the Rx output at baseband (relative harmonic=0) or absolute (while sweeping the target baseband frequency range).I expected that regardless of ALL or USB, for the baseband signal, should get the same result. The issue is that when plotting USB noise after doing USB-noise sim or ALL-noise sim, I get different results. This I cannot understand. Also when plotting the noise summary, different components are having different contribution for ALL and USB noise sims. So which one can I trust?
Thanks for your support!
I can't think of a good reason why you'd get different USB noise results between running USB or ALL mode - that doesn't make sense to me. I think we'd need to look at this via customer support to understand whether it's a usage issue or a bug.
Thanks for your reply. I escalated this inside my company. My colleagues from the methodology department is tackling the issue. They will probably escalate it to Cadence support team. Thanks for your time!