Wide dynamic range active pixel with knee response

An imaging device, comprising:

• a semiconductor substrate;
• an array of pixels formed on said substrate, each pixel having a pixel circuit comprising:
• a photoconversion device for accumulating a charge at an integration node;
• a transfer transistor, having one source/drain terminal connected to said integration node and another source/drain terminal connected to a reset line;
• an output circuit, connected to said integration node;
• and
• a feed-through pulse capacitor, having one terminal coupled to a feed-through pulse signal line, and a second terminal coupled to said integration node, said feed-through pulse signal line producing an intermediate pulse that interrupts a charge integration period to create a first charge integration period and a second charge integration period.

An imaging system, comprising:

• a plurality of pixels arranged in rows and columns, each pixel being associated with a column line, each pixel having a pixel circuit comprising:
• a photodiode for accumulating charge during a first integration period and second integration period, said device being connected to an integration node;
• a first transistor, having one terminal connected to said integration node and another terminal connected to a reset line;
• an output circuit, connected to said integration node, for reading out a signal at said integration node;
• and
• a feed-through pulse capacitor, having one terminal coupled to a feed-through pulse signal line, and a second terminal coupled to said integration node;
• wherein an excess charge overflows through said first transistor in response to an intermediate pulse generated by said feed-through pulse signal line.