Based on these theories, we can deduce the error diffusion with output-dependent feedback method that can control the dot-gain distortion well.

This article simply introduces the work principles self-checking methods differential gain distortion DG differential phasic distortion DP of MD1721 Model Vector Oscollograph.

Additional negative feedback is provided to set loop gain to unity at the oscillation frequency, to stabilize the frequency of oscillation, and to reduce harmonic distortion.