Imaging apparatus and electronic device

An imaging apparatus comprising:

• pixel circuits that each output an electric charge signal generated by receiving incident light and performing optical-to-electrical conversion on the incident light;
• an AD converter that compares the electric charge signal with a reference signal for each of the pixel circuits, and outputs, as a conversion result, a code input signal at a time when a comparison result has been inverted;
• an encoder that encodes the conversion result from the AD converter;
• a memory that holds the encoding result;
• and
• an output circuit that outputs the encoding result held by the memory;
• and
• a decoder that decodes the encoding result held by the memory, wherein
• the pixel circuits are disposed in a first substrate,
• the AD converter, the encoder and the decoder are disposed in a second substrate that is stacked in a lower layer than the first substrate,
• the decoder decodes the code input signal of a reset level of each of the pixel circuits, and
• the output circuit performs correlated double sampling (CDS) by using the code input signal of the reset level, the code input signal being decoded by the decoder, and the code input signal of a signal level of each of the pixel circuits, and outputs a CDS result.