 We put a function FUNCPOLY to adjust amplitude and DC (direct current)
offset of the Base Band. Let's open a monitor for that.  You may see the function is ( y = 0.0001x + 1.0 ).  Open a monitor for WAVOUT (U_18) which shows the output of FUNCPOLY.  The amplitude has become very small (P-P is 2.0) and DC offset has become 1. As you see, the Base Band needs to be positive value anytime. 
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