Signal output device

A signal output device which outputs a high peak and a low peak from a differential signal including a high signal and a low signal offset with a DC component, the signal output device comprising:

• a high-side comparator having an input terminal, of which one end is input with one of the high signal and the low signal and of which the other end is input with the other of the high signal and the low signal and detecting the high peak of the high signal;
• a low-side comparator having an input terminal, of which one end is input with one of the high signal and the low signal and of which the other end is input with the other of the high signal and the low signal and detecting the low peak of the low signal;
• a high-side AC coupling unit which is connected to one end of an input terminal of the high-side comparator and removes a DC component from one of the high signal and the low signal;
• a low-side AC coupling unit which is connected to one end of an input terminal of the low-side comparator and removes the DC component from one of the high signal and the low signal;
• and
• a threshold output unit which outputs a high-side threshold DC voltage combined with an output of the high-side AC coupling unit and outputs a low-side threshold DC voltage combined with an output of the low-side AC coupling unit,
• wherein the high-side AC coupling unit is connected to an input terminal to which the low signal is input when the high-side threshold voltage is higher than the voltage of the DC component of the differential signal, and the high-side AC coupling unit is connected to an input terminal to which the high signal is input when the high-side threshold voltage is lower than the voltage of the DC component of the differential signal, and
• wherein the low-side AC coupling unit is connected to an input terminal to which the high signal is input when the low-side threshold voltage is higher than the voltage of the DC component of the differential signal, and the low-side AC coupling unit is connected to an input terminal to which the low signal is input when the low-side threshold voltage is lower than the voltage of the DC component of the differential signal.