Post subject: Troubleshooting The example Mixer Project
Posted: Thu Oct 06, 2005 4:22 pm
May 09, 2004 1:23 am
Location: Morgan Hill, CA (Silicon
Valley, Bay Area)
Okay, I decided to drive home for lunch so that
I could gather a few screen captures (I am lucky in that I live and
work in the same town).
Below is a schematic of the example
design (SweptRF.dsn) from the Mixers_prj project and below this we see
graphs of the resultant simulation.
As stated in my last post
I've only added one net at the LO port of the mixer and named it "VLO"
then I produced a plot of the VLO and Vrf (verses swept RF frequency,
Frf) as shown in the graphs below. The third screen capture shows the
As can be seen from these graphs the project appears
to be running correctly, but when I try to look at the signals going
into the mixer I do not see anything that would make sense. In the graphs
RF power should say -20dBm at 1GHz and LO power should read -5dBm at
1GHz-70MHz= 930MHz, but as the two graphs show LO power is below -50dBm
and RF power is below -60dBm.
Perhaps the graphs that I have
drawn take frequency samples that do not sample exactly at 1GHz and
930MHz thus explaining absence of power. I do not know.
Post subject: Posted:
Thu Oct 06, 2005 4:25 pm
Joined: Sun May 09,
2004 1:23 am
Location: Morgan Hill, CA (Silicon Valley,
Opps! I screwed up. This posting was supposed to go under
"ADS using Harmonic Balance with mixers," but I've created a new post
If anyone can move this message for me (or delete
it so that I can repost in the correct area) I'd appreciate it.