Solid-state imaging device, camera, and driving method for solid-state imaging device

A driving method for a solid-state imaging device which has unit pixels arranged in rows and columns and reads a pixel signal from each of the unit pixels selected on a row basis,

• wherein the solid-state imaging device includes:
• amplifying transistors each of which is arranged in a corresponding one of the unit pixels and outputs the pixel signal;
• first transistors each of which is arranged on a column basis and supplies bias current to one of the amplifying transistors corresponding to a selected row;
• a second transistor, one of a source terminal and a drain terminal of which is short circuited with a gate terminal, which generates (i) a constant reference bias current through the source terminal and the drain terminal and (ii) a reference bias voltage at the gate terminal;
• a bias signal line through which the reference bias voltage is supplied from the gate terminal of the second transistor to gate terminals of the first transistors to mirror the bias current with respect to the reference bias current;
• and
• a low-pass filter inserted to the bias signal line between the gate terminal of the second transistor and the gate terminals of the first transistors, and
• each of said unit pixels includes:
• a photodiode which converts light to signal charge;
• a floating diffusion layer which holds the signal charge;
• a reset transistor which resets the signal charge in said floating diffusion layer;
• a transfer transistor which transfers the signal charge from said photodiode to said floating diffusion layer;
• and
• one of said amplifying transistors which outputs the pixel signal according to the signal charge held by said floating diffusion layer,
• said driving method for the solid-state imaging device comprises:
• switching on the switching element during a first period, and
• switching off the switching element when the first period ends, the first period being a period in which the resetting operation is performed by the reset transistor.