The word Prototype means The Original sample, which leads to develop more from it. So Analogue Prototyping means the Analogues circuit and Digital Prototyping circuits mean the circuits based on Digital techniques.
The word Prototype means The Original sample, which leads to develop more from it. So Analogue Prototyping means the Analogues circuit and Digital Prototyping circuits mean the circuits based on Digital techniques.
Depends on the success of the prototype: Create copies directly from the prototype's mask set if the prototype works as intended, otherwise change the design, which usually needs the change of at least one, more often several -- up to all -- masks.
Quite often, prototypes are fabbed on multi-client wafers; in this case a new mask set has to be created anyway for volume production, independent of successful realization.