Waveform shaping circuit, signal generation apparatus, and signal reading system

A waveform shaping circuit comprising:

• a capacitor with one end connected to an input where an input pulse signal is inputted and another end connected to an output;
• a first impedance element that has one end, which is connected to the other end of the capacitor, and another end, to which a target constant voltage is applied, and supplies the target constant voltage to the other end of the capacitor;
• a switch circuit that includes a switch without including a diode, has one end connected to the output and has another end to which the target constant voltage is applied, applies, in a state where the switch is on, the target constant voltage to the output and stops, in a state where the switch is off, application of the target constant voltage to the output;
• and
• a switch control circuit that generates and outputs, based on the input pulse signal, a control pulse signal that shifts the switch into the on state during a high voltage period in an AC component of the input pulse signal and shifts the switch to the off state during a low voltage period of the AC component,
• wherein the waveform shaping circuit shapes the input pulse signal into an output pulse signal whose peak-to-peak voltage is equivalent to a peak-to-peak voltage of the AC component and whose voltage during the high voltage period is set at the target constant voltage, and outputs the output pulse signal from the output.