Imaging device

An imaging device comprising:

• a plurality of pixel circuits that each generates a pixel signal including a pixel voltage corresponding to an amount of received light, and performs AD conversion by comparing the pixel signal with a reference signal;
• and
• a reference signal generator including a signal generation circuit and a voltage follower circuit, the signal generation circuit that generates a voltage signal having a ramp waveform, and the voltage follower circuit that performs a voltage follower operation on a basis of the voltage signal to generate the reference signal, and supplies the reference signal to the plurality of pixel circuits,
• wherein the voltage follower circuit includes an amplifier having a positive input terminal that is supplied with the voltage signal, a negative input terminal, an output terminal that is coupled to the negative input terminal and outputs the reference signal, and an output circuit coupled to the output terminal,
• wherein the output circuit includes
• a first transistor of a first electrical conductivity type having a source coupled to a first power supply node, a drain coupled to the output terminal, and a gate, and
• a second transistor of a second electrical conductivity type having a source coupled to a second power supply node, a drain coupled to the output terminal, and a gate, and
• wherein the amplifier includes a first differential transistor pair that is coupled to the positive input terminal and the negative input terminal, and generates a differential current including a first current and a second current.