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- W1576161570 abstract "Noise in photodiode-type CMOS active pixel sensors (APS) is primarily due to the reset (kTC) noise at the sense node, since it is difficult to implement in-pixel correlated double sampling for a 2-D array. Signal integrated on the photodiode sense node (SENSE) is calculated by measuring difference between the voltage on the column bus (COL) - before and after the reset (RST) is pulsed. Lower than kTC noise can be achieved with photodiode-type pixels by employing softreset technique. Soft-reset refers to resetting with both drain and gate of the n-channel reset transistor kept at the same potential, causing the sense node to be reset using sub-threshold MOSFET current. However, lowering of noise is achieved only at the expense higher image lag and low-light-level non-linearity. In this paper, we present an analysis to explain the noise behavior, show evidence of degraded performance under low-light levels, and describe new pixels that eliminate non-linearity and lag without compromising noise." @default.
- W1576161570 created "2016-06-24" @default.
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- W1576161570 date "1999-06-09" @default.
- W1576161570 modified "2023-10-03" @default.
- W1576161570 title "Analysis and Enhancement of Low-Light-Level Performance Photodiode-Type CMOS Active Pixel Imagers Operated with Sub-Threshold Reset" @default.
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