
Analogue integrated circuits 171
amp circuit so that the output swings between “fully-on” and “fully-off”, depending on
the polarity of the differential input voltage, and there should be no stable state in
between. Input-referred and open-loop parameters − offsets, bias currents, temperature
drift, noise, common mode and power supply rejection ratio, supply current and open-
loop gain − are all specified in the same way as op-amps. Output and ac parameters are
specified differently.
5.3.1 Output parameters
The most frequent use of a comparator is to interface with logic circuitry, so the output
circuit is designed to facilitate this. Two configurations ...