Maybe this is extremely trivial.
I have a transient analysis over a buck regulator and can't figure out how to plot Vpp. I just want to sweep some capacitors and see the ripple.
In PSpice you can add expression directly to plot (like V*sqrt(2)), I can't figure out how to do this in LtSpice. If I click the name of the plot, I can enter some expression but always gave me error such as "undefined symbol" Vpp(noo4)
I also added a .measure directive in schematic but nothing happens to the plot
.meas TRAN x PP v(n004)
What I miss? Thank you.