Circuit for monitoring a digital signal generator

摘要

A monitoring circuit for monitoring a digital signal generator which generates signals that are linear combinations of sinewave signals each of whose frequencies are defined by a coefficient K that is proportional to the corresponding frequency. The generator including means for storing the coefficients corresponding to all the signals to be emitted, the coefficients having an integer portion and a fraction portion whose number of digits defines the smallest possible coefficient value which corresponds to a signal of minimum frequency fm such that all signals emitted by the generator are at frequencies which are multiples of the frequency fm. The monitoring circuit includes a redundancy calculator circuit (EX, RR) connected to the output S of the generator (G), and comparator means (CC) comparing the redundancy calculated by the redundancy calculator circuit with a stored constant theoretical value.