发明名称 Feedthrough-compensated image sensor
摘要 A control pulse is generated a first control signal line coupled to a transfer gate of a pixel to enable photocharge accumulated within a photosensitive element of the pixel to be transferred to a floating diffusion node, the first control signal line having a capacitive coupling to the floating diffusion node. A feedthrough compensation pulse is generated on a second signal line of the pixel array that also has a capacitive coupling to the floating diffusion node. The feedthrough compensation pulse is generated with a pulse polarity opposite the pulse polarity of the control pulse and is timed to coincide with the control pulse such that capacitive feedthrough of the control pulse to the floating diffusion node is reduced.
申请公布号 US9264639(B2) 申请公布日期 2016.02.16
申请号 US201514616546 申请日期 2015.02.06
申请人 Rambus Inc. 发明人 Guidash Michael;Endsley Jay;Ladd John;Vogelsang Thomas;Smith Craig M.
分类号 H04N5/374;H04N5/365;H04N5/378;H04N5/376;H04N5/357;H01L27/146 主分类号 H04N5/374
代理机构 代理人 Shemwell Charles
主权项 1. A method of operation within an integrated-circuit image sensor having a pixel array, the method comprising: generating, on a first signal line of the pixel array that is connected to a transfer gate of a first pixel within the pixel array, a control pulse that enables photocharge accumulated within a photosensitive element of the first pixel to be transferred to a floating diffusion node, the first signal line having a capacitive coupling to the floating diffusion node; generating, on a second signal line of the pixel array that also has a capacitive coupling to the floating diffusion node, a first feedthrough compensation pulse having a pulse polarity opposite a pulse polarity of the control pulse and that is timed to coincide with the control pulse such that capacitive feedthrough of the control pulse to the floating diffusion node is reduced; and wherein the pixel array comprises a first pixel row constituted by a first plurality of pixels, including the first pixel, connected to the first signal line, and a second pixel row constituted by a second plurality of pixels connected to the second signal line, and wherein the second signal line is coupled to a respective transfer gate within each pixel of the second plurality of pixels.
地址 Sunnyvale CA US