Parity checking circuit for continuous voltage signals - used for process or circuit function monitoring, including multichannel comparator with digital output

摘要

The circuit has an input channel for each voltage signal and a multi-channel comparator (VG1, VG2) coupled in series with each input channel comparing the respective voltage signal with at least one further voltage signal. Each comparator channel (VG1, VG2) provides a digital output with two possible values, with all the comparator channels (VG1, VG2) connected to a common circuit output (A) via a switch (R), such that an output signal, indicating correct functioning of all circuits etc. is only provided when the output signals form all the channels have a selected value outof the two possible values. Pref. each comparator channel (VG1, VG2) uses different circuit components and/or layout so that they have different responses to temp. variations, store electromagnetic fields etc.