Voltage Controlled Asymmetric Linearity
Original Publication Date: 1989-Jun-01
Included in the Prior Art Database: 2005-Jan-28
In a CRT display, an S-shaped current waveform is required through the vertical yoke to provide an undistorted character display. This shaped ramp is generated by adding an exponential charging waveform to an integrated ramp waveform. In the circuit disclosed a variable DC voltage input is used to control the level of correction applied to a vertical ramp generator. The DC voltage may be set up by electronic control.