Circuit arrangement for supplying a periodic, substantially parabolic signal

A circuit arrangement for supplying a periodic, substantially parabolic signal to an output terminal, said circuit arrangement including a sawtooth generator for supplying a periodic sawtooth signal having a period with a trace time and a retract time, said sawtooth generator having a control input for receiving a control signal for triggering starting instants of said trace time and said retrace time, a parabolic generator having an input for receiving the sawtooth signal and an output for supplying the substantially parabolic signal to the output terminal during the trace time, and an arcuate signal generator for supplying an arcuate signal to the output terminal during the retrace time of the sawtooth signal, wherein at a start of a retrace time;

• the arcuate signal and a derivative with respect to time of the arcuate signal are given respective values which are substantially equal to corresponding values of the substantially parabolic signal and a derivative with respect to time of the substantially parabolic signal, respectively, at an end of a preceding trace time, characterized in that said circuit arrangement further comprises a pulse circuit for generating the control signal for said sawtooth generator and for generating switching pulses, a predetermined number of said switching pulses occurring during said retrace time, and the arcuate signal generator comprises means for generating the arcuate signal in response to said parabolic signal and said switching pulses, whereby at an end of the retrace time, the arcuate signal and the derivative with respect to time of the arcuate signal have respective values which are substantially equal to corresponding values of the substantially parabolic signal and the derivative with respect to time of the substantially parabolic signal, respectively, at a start of a following trace time.