I simulate a single balanced mixer in ADS and i am using harmonic balance for gain.
At the output i have a low pass filter.
When i simulate the mixer with "ideal filter" (lumped element filter) everything seems ok. But when i draw the layout of the filter and then i create the EM model, I insert the model in the schematic and the gain is much more different. Why is this happening?
When i simulate only the 2 filters with s-parameters simulation the results are quite close.
RF,LO freq: 5-8 GHz
IF freq: 200Mhz-1.2 Ghz
Filter: Low pass cut off frequency 1.2 GHz