| 摘要 |
An imaging element (50) that includes a photodiode (21) and an amplifier for integrating photocurrent from the photodiode. The amplifier includes an input follower (51), a level shifter (52), and an output amplifier (53). The level shifter (52) provides DC isolation between the follower output and the output amplifier (53). The input follower (51) includes an input transistor (62) connected to the photodiode (21), and the output amplifier (53) has an input transistor (66) connected to the level shifter (52). The sizes of these transistors are chosen such that the area of the input transistor (62) in the input follower (51) is less that the area of the input transistor (66) in the output amplifier (53). The input follower (51) preferably utilizes PMOS transistors. |
