Voltage variation compensation arrangement for sample and hold capacitor

摘要

An analog multiplier generates an output signal that is coupled to a convergence winding of a projection television. The analog multiplier multiplies a horizontal rate sawtooth signal with a vertical rate parabola signal. The multiplier DC operating point is adjusted, by developing a DC voltage in a hold capacitor of a sample and hold arrangement during each vertical blanking interval. To prevent a change in the capacitor voltage during vertical trace, a vertical rate sawtooth signal is coupled to the hold capacitor via a second capacitor.