Nice @holder. I miss the “Laplace primitive” (as I remember being called in some other EDAs) in the library, which allowed me to simulate control logic with some circuits.
Advancing the discussion, “U*” cold not be the most appropriated reference name since it is not direct related to a chip but a logic of simulation or be assembled (maybe a better could be X or M, but it is necessary to check the standard for this).
I propose a simple “difference symbol” for the operator (with gain=1). The idea could be also used to the “sum symbol operator”
About the integrator, I propose a more “formal symbol” or even a version with single input (since the integrative effect of a difference could be created by a concatenation of a difference and integrator).
Also the correspondent “differentiator symbol”, following the same pattern chosen to the integrator symbol.
The “multiplicator”.
The last, the AD and DA, I like use the symbology that the manufactures use into the datasheets (also some books of the area). If it is need a analog + and - (not just the signal reference to 0V of the simulation), follow the propose.
