Imaging apparatus

An imaging apparatus comprising:

• an imaging unit in which a plurality of pixels, each of which has a photoelectric conversion element and is configured to output a pixel signal, are disposed in a matrix of M (M is a natural number greater than or equal to 2) rows by N (N is a natural number greater than or equal to 2) columns;
• a reference signal generation unit configured to generate a reference signal which increases or decreases over time;
• a comparison unit configured to compare the pixel signal to the reference signal and end a comparison process at a timing at which the reference signal satisfies a predetermined condition with respect to the pixel signal;
• a clock generation unit having a plurality of delay units and configured to generate a plurality of phase signals having phases different from each other based on signals output from the plurality of delay units;
• a signal transmission unit provided to correspond to the plurality of phase signals and having a plurality of signal transmission circuits configured to transmit the plurality of phase signals;
• and
• a latch unit having a plurality of latch circuits configured to latch the plurality of phase signals transmitted by the signal transmission unit at the timing of an end of the comparison process,
• wherein the plurality of signal transmission circuits have main buffer circuits,
• wherein a configuration of the signal transmission circuit that transmits a first phase signal which is any one of the plurality of phase signals is substantially the same as a configuration of the signal transmission circuit that transmits a second phase signal which is any one of the plurality of phase signals and is different from the first phase signal, and
• wherein a configuration of the latch circuit that latches the first phase signal is substantially the same as a configuration of the latch circuit that latches the second phase signal.