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A project was made to demonstrate the impact and functionality of the IP= 2H parameter of the MWO NL_AMP model.
You will see in the schematic that IP2H is set to 40 dBm. In the graph '= pout', the power at the fundamental and the power at the 2nd harmonic are b= eing plotted. The markers are there to get the equation for both curves in = the linear region. For the fundamental pout =3D pin +8. For the 2nd harmoni= c, pout =3D 2*pin-24. The intercept point will be where pout and pin are eq= ual for both curves, or in other words, where the two linear lines cross. S= olving both equations for pin and pout results in an intercept points pin= =3D32 and pout=3D40, which was set in the model.
Hopefully this gives some meaning to what IP2H (intercept point 2nd harm= onic) really means. To visualize this, tune on IP2H and watch the 2nd harmo= nic power curve move in the pout graph.
This project shows some basic concepts of nonlinear devices and saturati= on. Look at the "fundamental_2nd_and_3rd" graph. This is the same as the po= ut graph but now the 3rd harmonic is added. Notice that the 2nd harmonic wi= ll saturate like the fundamental but the 3rd harmonic does not. This can be= explained from the waveform at the output. In the linear region, the wavef= orm will be a pure sinusoid (assuming class A operation). However, when the= amplifier saturates, the waveform is clipping. If driven hard enough, the = sine wave will approach a square wave which means that odd harmonics are be= ing added to the spectrum. This is why the third harmonic rises as the ampl= ifier goes into compression but not the 2nd.