Image sensors with extended dynamic range

An image sensor pixel comprising:

• a photodiode;
• a charge transfer transistor coupled between the photodiode and a floating diffusion node;
• a reset transistor having a first source-drain terminal coupled to the floating diffusion node, a second source-drain terminal configured to receive a reset voltage, and a gate terminal configured to receive a reset control signal;
• a capacitor directly coupled to the reset transistor and configured to receive overflow charge from the photodiode during an integration phase, wherein the reset control signal is dynamically adjusted during the integration phase to extend a dynamic range of the image sensor pixel;
• and
• a low conversion gain (LCG) transistor coupled between the floating diffusion node and the reset transistor, wherein the LCG transistor is controlled by a gain control signal different than the reset control signal.

An image sensor pixel comprising:

• a photodiode;
• a charge transfer transistor coupled between the photodiode and a floating diffusion node;
• a first reset transistor having a first source-drain terminal coupled to the floating diffusion node and a gate terminal configured to receive a reset control signal;
• a second reset transistor having a first source-drain terminal coupled to the floating diffusion node and a second source-drain terminal configured to receive a reset voltage;
• a capacitor directly coupled to a second source-drain terminal of the first reset transistor and configured to receive overflow charge from the photodiode during an integration phase;
• a low conversion gain (LCG) transistor coupled between the photodiode and the second source-drain terminal of the first reset transistor;
• and
• a middle conversion gain (MCG) transistor coupled between the photodiode and the LCG transistor.