A vertical deflection ramp voltage is generated by the charge and discharge of a resistor capacitor combination. The voltage ramp is coupled to an amplifier which drives a current through a deflection coil producing a magnetic deflection field. The ramp voltage produced by the resistor capacitor combination...http://www.google.ca/patents/US5198731?utm_source=gb-gplus-sharePatent US5198731 - Linearization of vertical reference ramp
