Generator for producing a sawtooth and a parabolic signal
AssigneeU.S. Philips Corporation
InventorRobert Tiemeijer
Life of this patent
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Abstract
A generator suitable for producing a sawtooth and a parabolic signal for the line or field deflection in a television system. The generator is provided with two dc coupled, series-connected difference amplifiers with feedback, which are each part of an associated integrating circuit. Via a peak detection circuit the output of the second difference amplifier is connected to the non-inverting input of the first difference amplifier. The second integrating circuit has been rated in such a way that the peak-peak value of the parabolic signal is half that of the sawtooth signal, while independent of the peak-peak value adjustment the ground potential is present in both signals in the center of trace; consequently there are no centering difficulties.
Claims6
A generator for producing a sawtooth and a separate parabolic signal, said generator comprising a first integrating circuit a second integrating circuit direct current coupled to said first circuit, each circuit comprising a difference amplifier and a capacitor in a feedback path from an output to an inverting input of the same difference amplifier, and a peak detection circuit coupled from the second circuit difference amplifier output to a non-inverting input of the difference amplifier in the first integrating circuit.
Dependencies are inferred from the claim text.