Delay adjustment circuit and distance measuring device

A distance measuring device, comprising:

• a delay adjustment circuit including:
• a plurality of delay adjustment units connected in series, wherein each of the delay adjustment units including:
• one or more first delay elements, connected in series, configured to delay an input signal based on a clock, and
• a first selector configured to output one of the input signal or an output of a first delay element at a last stage among the one or more first delay elements, wherein each of the plurality of delay adjustment units includes a different number of the first delay elements, and
• an output unit configured to output the clock based on an output of the first selector included in a delay adjustment unit of a last stage among the plurality of delay adjustment units;
• a light source unit configured to emit light based on a light emission instruction;
• a light receiving unit configured to receive light;
• and
• a distance measuring unit configured to perform distance measurement based on a light emission timing at which the light is emitted by the light source unit and a light reception timing at which the light is received by the light receiving unit,
• wherein the light source unit is further configured to emit light based on the clock output from the output unit of the delay adjustment circuit using the light emission instruction as the input signal.