Periodic waveform generator

Claim 1

ELECTRONIC APPARATUS FOR PERIODICALLY PRODUCING A PARABOLIC WAVEFORM COMPRISING; A CHARGING TRANSISTOR, SAID CHARGING TRANSISTOR BEING BIASED IN A CONSTANT CURRENT CONFIGURATION, A FIRST CHARGING CAPACITOR, SAID CHARGING TRNASISTOR BEING CONNECTED TO SAID FIRST CHARGING CAPACITOR SO THAT SAID FIRST CHARGING CAPACITOR IS CHARGED FROM A CONSTANT CURRENT SOURCE, A FIRST SWITCHING TRANSISTOR, SAID FIRST SWITCHING TRANSISTOR BEING SWITCHED BETWEEN THE CONDUCTING AND NON-CONDUCTING STATES BY A SUITABLE PERIODIC SWITCHING POTENTIAL, THE CONSTANT CURRENT FROM SAID CHARGING TRANSISTOR CHARGING SAID FIRST CHARGING CAPACITOR LINEARLY WHEN SAID FIRST SWITCHING TRANSISTOR IS IN THE NONCONDUCTING STATE, MEANS CONNECTED TO SAID FIRST CHARGING CAPACITOR FOR PRODUCING A LINEARLY VARYING CHARGING CURRENT, A SUMMING TRANSISTOR HAVING AN INPUT ELECTRODE, AN OUTPUT ELECTRODE AND A CONTROL ELECTRODE, SAID LINEARLY VARYING CHARGING CURRENT PRODUCING MEANS BEING CONNECTED TO THE INPUT ELECTRODE OF SAID SUMMING TRANSISTOR, A SECOND CHARGING CAPACITOR, THE OUTPUT ELECTRODE OF SAID SUMMING TRANSISTOR BEING CONNECTED TO SAID SECOND CHARGING CAPACITOR SO THAT SAID LINEARLY VARYING CHARGING CURRENT IS FED TO SAID SECOND CHARGING CAPACITOR, A SECOND SWITCHING TRANSISTOR CONNECTED ACROSS SAID SECOND CHARGING CAPACITOR, SAID SECOND SWITCHING TRANSISTOR BEING SWITCHED BETWEEN THE CONDUCTING AND NON-CONDUCTING STATES BY A PERIODIC GATING VOLTAGE, WHEREBY THE VOLTAGE ON SAID SECOND CHARGING CAPACITOR IS THE DESIRED PARABOLIC WAVERFORM WHEN SAID SECOND SWITCHING TRANSISTOR IS IN THE NON-CONDUCTING STATE.