Stabilized duty cycle modulated multivibrator

Claim 1

A FREE RUNNING MULTIVIBRATOR COMPRISING A PAIR OF TRANSISTORS, EACH HAVING ITS COLLECTOR ELECTRODE CONNECTED TO A SOURCE OF POTENTIAL, A CAPACITOR CONNECTED BETWEEN THE EMITTER ELECTRODES OF SAID TRANSISTORS, THE BASE ELECTRODE OF ONE OF SAID TRANSISTORS BEING CONNECTED TO THE COLLECTOR ELECTRODE OF THE OTHER OF SAID TRANSISTORS, THE FREQUENCY OF OSCILLATION OF SAID MULTIVIBRATOR BEING DETERMINED BY THE TIME REQUIRED FOR THE VOLTAGE ACROSS SAID CAPACITOR TO SWING BACK AND FORTH BETWEEN TWO VALUES, A DIFFERENTIAL AMPLIFIER COMPRISING FIRST AND SECOND TRANSISTORS, THE COLLECTOR OF SAID FIRST TRANSISTOR BEING CONNECTED TO ONE SIDE OF SAID CAPACITOR AND THE COLLECTOR OF SAID SECOND TRANSISTOR BEING CONNECTED TO THE OTHER SIDE OF SAID CAPACITOR, THE EMITTERS OF SAID FIRST AND SECOND TRANSISTORS BEING CONNECTED TOGETHER AND TO A FURTHER SOURCE OF POTENTIAL, SAID FIRST TRANSISTOR PROVIDING A NORMALLY CONSTANT CURRENT LOAD IN THE PATH OF CURRENT FLOWING INTO AND OUT OF SAID CAPACITOR WHEN THE VOLTAGE ACROSS SAID CAPACITOR IS CHANGING IN ONE DIRECTION, SAID SECOND TRANSISTOR PROVIDING A NORMALLY CONSTANT CURRENT LOAD IN THE PATH OF CURRENT FLOWING INTO AND OUT OF SAID CAPACITOR WHEN THE VOLTAGE ACROSS SAID CAPACITOR IS CHANGING IN THE OTHER DIRECTION, THE NORMALLY CONSTANT CURRENTS OF SAID LOADS BEING VARIABLE DIFFERENTIALLY IN ACCORDANCE WITH AN INPUT SIGNAL APPLIED TO THE BASE OF SAID FIRST TRANSISTOR WHILE MAINTAINING SAID NORMALLY CONSTANT CURRENTS RELATED TO SAID INPUT SIGNAL, AND MEANS CONNECTED BETWEEN SAID PAIR OF TRANSISTORS AND SAID DIFFERENTIAL AMPLIFIER TO GENERATE A VOLTAGE PROPORTIONAL TO THE DUTY CYCLE OF THE OSCILLATION OF THE MULTIVIBRATOR AND TO APPLY SAID VOLTAGE AS NEGATIVE FEEDBACK TO SAID DIFFERENTIAL AMPLIFIER TO RENDER THE RELATIONSHIP BETWEEN SAID INPUT SIGNAL AND THE DUTY CYCLE SUBSTANTIALLY LINEAR.