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ADEXL dc sweep

Hi,

I have a top schematic (symbol) connected to 4 voltage sources vdc (say V1, V2, V3, V4) and I use ADEXL.
The two (V1, V2) of the voltage sources have defined dc values (actually I define in each source in the schematic a parameter as a dc voltage value say Vone and Vtwo, to which I give through ADEXL some values so as to examine different corners).

The problem starts from now and on:

I want to sweep the other two (V3 and V4, their dc voltages are defined in the schematic as Vthree and Vfour). The sweep I want to do is for Vthree: 0->Vdd and for Vfour: Vdd-->0 (I want to use Vdd, not a specific value).

When I use the variables window (and the parameters tab) through ADEXL, and I try through the Value tab to sweep from/to 0-->Vdd I am not allowed to do it (the same for Vdd-->0).

Could anyone suggest any solution to this problem?

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