Circuit for generating a deflection current through the field deflection coil of a picture display device

In a circuit for generating a deflection current through the field deflection coil of a picture display device, comprising an amplifier and a sawtooth generator for supplying a sawtooth-shaped signal to the amplifier, said amplifier having an output terminal to which a series arrangement of the deflection coil and a separating capacitor is coupled, and further comprising a feedback network included in a feedback path arranged between the said series arrangement and a feedback input terminal of the amplifier, and also means for deriving from the sawtooth-shaped signal a parabolic signal for application to a signal input terminal of the amplifier, the improvement wherein the means for generating a parabolic signal comprises a multiplying circuit and the feedback path also comprises a combining stage having a first input terminal connected to the sawtooth generator and a second input terminal connected to the feedback network, said combining stage being adapted to apply first and second signals to the multiplying circuit and a third signal to the feedbck input terminal of the amplifier;

• the first, second and third signals being derived by the combining stage by linear combinations of fractional proporations of the signals at the first and second input terminals thereof, and an output terminal of the multiplying circuit being coupled to the signal input terminal of the amplifier for applying the parabolic signal thereto.