PURPOSE:To improve the duty correction effect without limiting the amplitude to an input signal by converting the amplitude change into the current change of a control signal and using this current change to correction of duty. CONSTITUTION:For a duty corrector, the input signals are applied to base input terminals 30 and 31 of transistors Tr32 and 33 constituting a differential amplifier A. A connection is secured between emitter terminals of the Tr32 and 33 via a resistance 38, and current sources are connected to these emitter terminals respectively. The currents of the current sources are controlled by the control signals supplied to terminals 13 and 14. Thus the duty variance of the input signal supplied to the amplifier A is corrected. Then the corrected signals are delivered through terminals 9 and 10. In such a way, the amplitude of the control signal is converted into a current. Therefore the input signal is not limited by the amplitude of the control signal.
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