Abstract: An analog/digital converter having a number of threshold circuits depending on the necessary bit resolution, the inputs of these threshold circuits being fed the analog signal to be digitized and the digitized signal being available at their outputs. The inputs of the threshold circuits are preceded by a modulator circuit in which the analog signal to be digitized is modulated by amplitude modulation upon a carrier frequency stable in frequency.

Abstract: A/D converters in which a carrier frequency signal is frequency-modulated with the analog signal to be converted. The frequency-modulated signal is fed in parallel to a plurality of resonance means each of which is tuned to a different resonance frequency in the peak frequency deviation range. Depending on whether a resonator is in the resonance state or not, it is assigned a logical value "1" or a logical value "O". The logical value pattern corresponding to the resonance pattern of all resonators then represents the digitized instantaneous value of the analog signal.