Reduction of distortion in pulsetransmission circuits

Claim 1

A PULSE TRANSMISSION CIRCUIT HAVING AN OUTPUT TERMINAL AND A PRASITIC CAPACITANCE BETWEEN SAID OUTPUT TERMINAL AND A POINT OF CONSTANT POTENTIAL, SAID CIRCUIT INCLUDING MEANS FOR ELIMINATING ADVERSE EFFECTS OF SAID PARASITIC CAPACITANCE COMPRISING A COMPENSATING TRANSISTOR HAVING EMITTER, BASE AND COLLECTOR ELECTRODES, SAID EMITTER ELECTRODE BEING CONNECTED TO SAID OUTPUT TERMINAL, SAID COLLECTOR ELECTRODE BEING DIRECTLY CONNECTED TO A POINT OF CONSTANT POTENTIAL, A SOURCE OF SIGNAL PULSES CONNECTED TO SAID CIRCUIT, SAID PULSES HAVING A POLARITY DRIVING SAID EMITTER ELECTRODE IN THE FORWARD DIRECTION, BIAS MEANS FOR APPLYING A FORWARD BIAS VOLTAGE TO SAID BASE ELECTRODE THUS RENDERING SAID TRANSISTOR NORMALLY CONDUCTING DUE TO SAID BIAS AND SUBSTANTIALLY SHORT-CIRCUITING SAID CIRCUIT, AND CONTROL MEANS FOR APPLYING A REVERSE BIAS SIGNAL TO SAID BASE ELECTRODE, SAID CONTROL MEANS OPERATING TO APPLY SAID REVERSE BIAS SIGNAL TO BE EFFECTIVE FOR THE DURATION OF THE LEADING EDGE OF EACH SIGNAL PULSE TO BLOCK THE NORMALLY CONDUCTING EMITTER COLLECTOR PATH OF SAID TRANSISTOR AND TO UNBLOCK SAID PATH PRIOR TO THE OCCURRENCE OF THE TRAILING EDGE OF EACH SIGNAL PULSE WHEREBY THE DISTORTION OF THE LEADING EDGE OF THE TRANSMITTED PULSES CAUSED BY THE PARASITIC CAPACITY IS AT LEAST PARTLY COMPENSATED BY THE DIFFUSION BACK TO THE EMITTER OF FREE CHARGE-CARRIERS STORED IN THE TRANSISTOR BASE ZONE, AND THE LENGTHENING OF THE PULSES CAUSED BY THE PARASITIC CAPACITANCE IS RESTRICTED.