Photoelectric conversion apparatus

A photoelectric conversion apparatus having a plurality of AD converters each provided for each of a plurality of pixels, the plurality of AD converters and the plurality of pixels being arranged in the same semiconductor substrate, wherein

• a signal line is provided for transmitting a signal from the plurality of pixels to the AD converter,
• the AD converter comprises:
• an arithmetic operation amplifying circuit unit for inputting as an input signal the signal from the signal line;
• a comparator circuit unit for comparing, with a reference signal, an output from the arithmetic operation amplifying circuit unit;
• a DA converted circuit unit for DA converting a signal based on a signal from the comparator circuit unit;
• and
• a sampling and holding unit arranged at an input section of the arithmetic operation amplifying circuit unit to hold the input signal of the arithmetic operation amplifying circuit unit, and
• the comparator circuit unit is arranged in a first region of the semiconductor substrate, the arithmetic operation amplifying circuit unit is arranged in a second region of the semiconductor substrate, and the DA converted circuit unit is arranged in a third region between the first and second regions of the semiconductor substrate.