**4.3 Power control standards**

Power control standards set some peculiar requisites on junction technologies, their operation being based on the overlapping of the range of currents of the steps and critical current. To fulfill these requirements, a tight control of junction hysteresis is needed.

Referring in particular to [47], where the parameters which must be fulfilled by the junctions to obtain the overlapping of the n=0 and n= 1 step are discussed, it is pointed that the mentioned overlapping is obtained in a stable way when f > (1.5-2) fc [48]. In particular the authors suggest the employ of edge type junctions with *Vc* as high as 1 mV.

However, in principle, no constraint on *Vc* is needed, while the need of a sufficient, but not exceedingly high overlapping of the two steps is the only fundamental aspect.
