Hi,
I'm trying to make a simple RF system noise figure using Harmonic Balance. Since my RF System is composed of a direct conversion receiver, then it follows that the local oscillator operates at the same frequency as that of the RF input signal. I set my input signal at 5.775 GHz at -70dbm, while the local oscillator is at the same frequency with 7dbm. I set the mixing order of the RF and LO signals at 5 while the max mixing order is 5 as well. When I simulate this, a warning message says that more than 1 mixing term has landed on the frequency. Is it ok to shift the LO frequency by a small amount? will this not affect simulation results, given that this should be a direct conversion receiver?
Thanks!
Lendl
I'm trying to make a simple RF system noise figure using Harmonic Balance. Since my RF System is composed of a direct conversion receiver, then it follows that the local oscillator operates at the same frequency as that of the RF input signal. I set my input signal at 5.775 GHz at -70dbm, while the local oscillator is at the same frequency with 7dbm. I set the mixing order of the RF and LO signals at 5 while the max mixing order is 5 as well. When I simulate this, a warning message says that more than 1 mixing term has landed on the frequency. Is it ok to shift the LO frequency by a small amount? will this not affect simulation results, given that this should be a direct conversion receiver?
Thanks!
Lendl
Hi,
I'm also trying to obtain IP2 and IP3 simulations using Harmonic Balance using the same direct conversion receiver.
Here are the parameters I inputted:
LO signal = 5.775 GHz (with an offset of 1Hz to avoid the warning message of colliding mixing terms) at 7dbm
Two tones at 5.77495 GHz and 5.77505GHz. (two tones separated by 100KHz.)
When computing for the power and the IMD at each node, what mixing indices should I use?
Since I have three tones, is it right to use mix{-1,1,0} for the power at each node, and mix{-1,2,-1} for the IMD at each node?
Thanks!
Lendl