A comparator is arranged to compare a series of analog voltage signal samples
on
a first capacitor with a voltage on a second capacitor which is linearly increased
or decreased to equal the sample value. The comparator's single output freezes
the count of the counter at counts which are proportional to the voltage of the
respective samples. In this manner, analog to digital conversion can be accomplished
using a single line between the analog and digital sides of a circuit, thereby
reducing parasitic capacitance.
