Pixel arrangement and method for operating a pixel arrangement

An image sensor comprising:

• an array of a pixel arrangement;
• and
• a row driver,
• wherein the pixel arrangement comprises:
• a photodiode,
• a circuit node,
• a transfer transistor coupled to the photodiode and to the circuit node,
• an amplifier with an input coupled to the circuit node,
• a first capacitor and a second capacitor,
• a first transistor coupled to an output of the amplifier and to the first capacitor,
• a second transistor coupled to the first transistor and to the second capacitor,
• a supply terminal,
• a reset transistor coupled to the supply terminal,
• a coupling transistor coupled to the circuit node and to the reset transistor, and
• a third capacitor with a first electrode coupled to a node between the reset transistor
• and the coupling transistor,
• wherein the row driver is configured to:
• provide a transfer signal to a control terminal of the transfer transistor,
• provide a coupling signal to a control terminal of the coupling transistor,
• provide a reset signal to a control terminal of the reset transistor,
• provide a first control signal to a control terminal of the first transistor, and
• provide a second control signal to a control terminal of the second transistor, and
• wherein a first pulse of the transfer signal in a first storage phase has a first voltage value and a second pulse of the transfer signal in a second storage phase has a second voltage value, the first voltage value being different from the second voltage value.

A method for operating a pixel arrangement, the method comprising:

• converting electromagnetic radiation into charge by a photodiode;
• providing a first pulse of a transfer signal to a transfer transistor and a pulse of a coupling signal to a coupling transistor for transferring the charge from the photodiode to a capacitance of a circuit node and to a third capacitor at a start of a first storage phase;
• providing a pulse of a first control signal to a first transistor and a pulse of a second control signal to a second transistor before an end of the first storage phase for charging a first and a second capacitor as a function of a capacitance voltage at the capacitance of the circuit node or providing the pulse of the first control signal to the first transistor before the end of the first storage phase for charging the first capacitor as the function of the capacitance voltage at the capacitance of the circuit node;
• providing a second pulse of the transfer signal to the transfer transistor for transferring further charge from the photodiode to the capacitance of the circuit node at a start of a second storage phase;
• and
• providing a pulse of the first control signal to the first transistor before the end of the second storage phase for charging the first capacitor as a function of the capacitance voltage at the capacitance of the circuit node or providing a pulse of the second control signal to the second transistor before the end of the second storage phase for charging the second capacitor as a function of the capacitance voltage at the capacitance of the circuit node.