Patent ID: 7697051

Claim:
An imager, comprising; a pixel, comprising; a floating diffusion region, a source follower transistor having a gate connected to said floating diffusion region, a first capacitive storage element that can be selectively coupled to the floating diffusion region through a first switchable element, wherein the first switchable element comprises a PMOS transistor, a second capacitive storage element that can be selectively coupled to the floating diffusion region through a second switchable element, wherein the second switchable element comprises a PMOS transistor, and a photosensitive element which can be coupled to said floating diffusion region, a third switchable element configured for operation in a sub-threshold reset mode for selectively resetting said floating diffusion region, wherein the third switchable element comprises an NMOS transistor; and a signal generator for providing timing signals to control said switchable elements such that said first switchable element is on and said second switchable element is off to cause photo generated charges provided by the photosensitive element to accumulate at said floating diffusion region having said first capacitive storage element coupled thereto during a first integration period, and following said first integration period, said first switchable element is off and second switchable element is on to cause photo generated charges provided by the photosensitive element to accumulate at said floating diffusion region having said second capacitive storage element coupled thereto during a second integration period.