Deflection circuits

Claim 1

A SWEEP CIRCUIT FOR A TELEVISION RECEIVER COMPRISING MEANS FOR GENERATING A SAWTOOTH VOLTAGE WAVE INCLUDING RAMP PORTIONS OF GRADUALLY CHANGING AMPLITUDE OCCURRING DURING DEFLECTION INTERVALS AND FLYBACK PORTIONS OF RAPIDLY CHANGING AMPLITUDE OCCURRING DURING RETRACE INTERVALS, AMPLIFIER MEANS INCLUDING AT LEAST ONE TRANSISTOR HAVING AN INPUT CIRCUIT INCLUDING FIRST AND SECOND INPUT ELECTRODES, AN OUTPUT ELECTRODE, AN OUTPUT CIRCUIT COUPLED TO SAID OUTPUT ELECTRODE, MEANS FOR COUPLING SAID SAWTOOTH VOLTAGE BETWEEN SAID FIRST INPUT ELECTRODES AND A POINT OF REFERENCE POTENTIAL, A DEFLECTION YOKE FOR THE PICTURE TUBE OF SAID RECEIVER, SAID YOKE COUPLED WITH SAID OUTPUT CIRCUIT AND THROUGH WHICH IT IS DESIRED TO PASS A SAWTOOTH CURRENT WAVE HAVING A SUBSTANTIALLY LINEAR RAMP PORTION, SAID OUTPUT CIRCUIT HAVING A COMPOSITE IMPEDANCE CHARACTERISTIC WHICH TENDS TO CAUSE DISTORTION AND NONLINEARITY IN THE SAWTOOTH CURRENT WAVES APPLIED THEREFROM TO SAID DEFLECTION COIL, NEGATIVE FEEDBACK MEANS COUPLED TO SAID OUTPUT CIRCUIT FOR DERIVING A FEEDBACK SIGNAL WHICH VARIES AS A FUNCTION OF CURRENT FLOW IN SAID DEFLECTION YOKE AND MEANS CONNECTED BETWEEN SAID FEEDBACK MEANS AND SAID TRANSISTOR FOR COUPLING SAID FEEDBACK SIGNAL BETWEEN SAID SECOND INPUT ELECTRODE AND SAID POINT OF REFERENCE POTENTIAL TO MODIFY THE COMPOSITE SIGNAL INPUT TO SAID AMPLIFIER SO THAT SAID COMPOSITE SIGNAL INPUT HAS A RAMP PORTION WHICH IS CURVED SUFFICIENTLY AND IN THE PROPER DIRECTION TO COMPENSATE FOR THE DISTORTION CAUSED BY SAID OUTPUT CIRCUIT WHEREBY SUBSTANTIALLY LINEAR SAWTOOTH DEFLECTION IS PRODUCED.