| 摘要 |
PURPOSE: A photodiode active pixel sensor with true CDS(Correlated Double Sampling) is provided to gain a high fill factor, and lower temporal noise by using only 3 transistors resulting in the higher fill factor. CONSTITUTION: An active pixel sensor having a plurality of pixels arranged in rows and columns that are read out of the active pixel sensor in a sequential order of rows with each of the pixels having a photodiode as the photodetecting element. The row that is currently being read has an amplifier within each of the pixel in that row operatively connected to a column signal bus by a reset transistor configuration. A floating diffusion within each pixel is operatively connected to the reset transistor within the pixel such that the reset gate on the reset transistor for the row of photodetectors that is currently being read is also connected to the drain of the next row of pixels to be read resulting in a configuration that allows selection and deselection of rows via the reset busses. During selection of a particular row the amplifiers within each pixel of that row are operatively connected to the column signal bus while the amplifiers of the remaining rows are deselected and not connected to the column signal bus.
|
