Circuit arrangement for monitoring a rectangular clock signal

摘要

The arrangement described for monitoring a rectangular clock signal contains a low-pass filter with a low cut-off frequency by means of which the average of the clock signal to be monitored is obtained. A window comparator following the low-pass filter outputs a binary one at its output when the average of the clock signal is not within predeterminable tolerance limits. This indicates not only the failure of the clock signal but also, for example, the degeneration of the clock pulses to needle pulses.