Patent ID: 7279951

Claim:
A pulse shaping circuit that performs logic processing on a pair of complementary pulse differentiated differential input signals obtained by subjecting a base pulse signal of a generally square wave shape to differentiation or high-pass filtration and obtains at least either a non-inversion shaped pulse signal that falls at a first timing at which the base pulse signal falls and rises at a second timing at which the base pulse signal rises or an inversion shaped pulse signal that rises at the first timing and falls at the second timing, comprising: an offset-added signal generation circuit that uses the pair of complementary pulse differentiated differential input signals, that is, a non-inversion first signal and an inversion second signal to generate a non-inversion fifth signal corresponding to the non-inversion first signal and an inversion fourth signal corresponding to the inversion second signal by adding an offset voltage so that a fourth reference voltage of the inversion fourth signal is relatively higher than a fifth reference voltage of the non-inversion fifth signal by an amount equivalent to a first offset voltage, and to generate a non-inversion third signal corresponding to the non-inversion first signal and an inversion sixth signal corresponding to the inversion second signal by adding an offset voltage so that a sixth reference voltage of the inversion sixth signal is relatively lower than a third reference voltage of the non-inversion third signal by an amount equivalent to a second offset voltage; a first comparison circuit that compares the non-inversion fifth signal with the inversion fourth signal to obtain a seventh signal that rises or an inversion seventh signal that falls at the second timing; a second comparison circuit that compares the non-inversion third signal with the inversion sixth signal to obtain an eighth signal that rises or an inversion eighth signal that falls at the first timing; and a logic processing circuit that obtains at least either the non-inversion shaped pulse signal or the inversion shaped pulse signal based on the seventh signal and the eighth signal or the inversion seventh signal and the inversion eighth signal.