Difference in output of calculator 'pvi' function between ADE XL and ADE L

Hi All,

I have been running a hb simulation with two input tones and observing power in the various generated products. In particular I am interested in a product that is at 6*f_RF-7*f_LO (the system is low-side LO and the product does generate a positive frequency). Using the 'pvi' function in the VIVA calculator with ADE L, and specifying the harmonics i.e.:

pvi("hb" "/net1" "/net2" "/PORT0/PLUS" "/PORT0/MINUS" '(6 -7))

evaluates to the same value as seen in plotting the spectrum and looking at the power of this particular tone. If I then open an ADE XL session (to run a Monte Carlo analysis), and use the ADE L state, the above pvi expression evaluates to 'nil'. In particular, the test cases I have ran show that the expression evaluates to 'nil' in ADE XL if the sum of the harmonics is less than zero, so in the case shown 6+(-7)=-1, but the same expression with 5*f_LO-4*f_RF evaluates as expected. I have also verified with 8*f_RF-9*f_LO that the function evaluates to 'nil' even though this is a positive frequency, and all other cases where the sum of the harmonic numbers is greater than or equal to zero evaluate properly as expected in ADE XL.

Does the expression need to be modified in some way to evaluate properly in ADE XL? I should mention this is being done in IC616.

Thanks!

Cooper