A phase/frequency comparator is described which includes two
edge-triggered storage elements, each set by an edge of a reference
frequency signal of a phase--or frequency-locked loop (PLL) and by an
edge of an output frequency signal of the PLL. The storage elements are
each reset by an output signal of a resetting logic unit, which is
activated when both output signals of the storage elements are activated
and then deactivated when the output signals are deactivated.