Current-controlled saw-tooth wave oscillator stage

A saw-tooth wave oscillator stage having an output terminal feeding a drive signal for driving a capacitive element to be alternately and periodically brought in a charge and in a discharge state and generating an output signal, said stage comprising:

• a first and a second, upper and lower, threshold voltages,
• a threshold detector circuit connected to said first and second threshold voltages and to said output terminal and having a pair of detector circuit outputs defining a differential voltage switching between a positive and a negative sign when said output signal reaches said first and second thresholds,
• a control and memory circuit connected to said detector circuit outputs for generating a differential charge and discharge signal alternately and periodically having charge and discharge phases, and
• an output driving circuit receiving said charge and discharge signal and generating said drive signal,
• wherein said control and memory circuit comprises a differential voltage detector connected between said detector circuit outputs for detecting switching of said sign of said differential voltage and for correspondingly switching said differential charge and discharge signal between said charge and discharge phases, and a memory element controlled by said differential voltage detector and connected to said driving circuit for maintaining said charge and discharge phases until subsequent switching of said differential voltage.