Top/bottom active pincushion circuit with ringing inhibit

摘要

A top/bottom pincushion correction amplifier has an inhibit terminal that is coupled to vertical deflection means for receiving an inhibit pulse that corresponds to a vertical retrace pulse in the yoke. A vertical amplifier feeds the yoke in series with the secondary winding of a pincushion transformer, the primary winding of which is supplied with a pincushion correction signal from the pincushion amplifier. The effect of the retrace pulse in the yoke in causing ringing in the pincushion transformer is nullified by the inhibit pulse which increases the output impedance of the pincushion amplifier.