A sawtooth generator with disturbance signal rejection for a deflection apparatus

摘要

In a vertical sawtooth generator (18), an end time (TEND) of a retrace portion of a vertical sawtooth signal is controlled by an output signal (112a) of a comparator (19). The comparator has a first input terminal (inverting) that is responsive to a reference voltage (VLOW) and a second input terminal (non-inverting) that is responsive to the sawtooth signal. The reference voltage is coupled to an input terminal (base of Q7) of an amplifier (Q5, Q6, Q7, Q8) of an integrator that generates the sawtooth signal. Any disturbance signal component in the reference voltage is super-imposed on the sawtooth signal. Because the same disturbance signal component is developed simultaneously in both input terminals of the comparator, a high degree of common mode rejection is provided with respect to the disturbance signal component.