Time of flight device and time of flight method

A time of flight device, comprising:

• a first time-to-digital converter;
• a second time-to-digital converter;
• a driving circuit, coupled to the first time-to-digital converter, and configured to simultaneously provide a pulse signal and a reference pulse signal, wherein the reference pulse signal is provided to the first time-to-digital converter so that the first time-to-digital converter determines first depth data based on the reference pulse signal;
• a sensing light source, coupled to the driving circuit, and configured to emit a light pulse to a sensing object based on the pulse signal;
• a sensing pixel, coupled to the second time-to-digital converter, and configured to receive a reflected light pulse reflected by the sensing object and output a reflected pulse signal to the second time-to-digital converter so that the second time-to-digital converter determines second depth data based on the reflected pulse signal;
• and
• a processing circuit, coupled to the first time-to-digital converter and the second time-to-digital converter, and configured to subtract the first depth data from the second depth data to obtain real depth data.