Manufacturing method, pulse detector, and x ray photoelectron spectroscopy apparatus

A manufacturing method for a CFD (Constant Fraction Discriminator) circuit that detects a pulse of an electron or radiation, the method comprising:

• a step of providing a delayed signal generation unit that generates a delayed signal by delaying the pulse by a predetermined time;
• a step of providing an attenuated signal generation unit that generates an attenuated signal by attenuating the pulse by a predetermined fraction;
• a step of providing a hysteresis comparator that includes two input terminals for receiving the delayed signal and the attenuated signal, has a first threshold and a second threshold smaller than the first threshold, outputs a first output when a difference between voltage values input to the two input terminals is greater than or equal to the first threshold, and outputs a second output when the difference between the voltage values input to the two input terminals is less than or equal to the second threshold;
• a step of providing a voltage supply unit that applies an offset voltage corresponding to the first threshold or the second threshold to the hysteresis comparator;
• and
• a step of setting the offset voltage, wherein
• the step of setting the offset voltage includes:
• setting a voltage corresponding to the first threshold as the offset voltage when the delayed signal is input to a non-inverting input terminal of the two input terminals in the CFD circuit, and
• setting a voltage corresponding to the second threshold as the offset voltage when the delayed signal is input to an inverting input terminal of the two input terminals in the CFD circuit.