| Autor: |
Arai, Toshiki, Kitamura, Kazuya, Yonai, Jun, Ohtake, Hiroshi, Hayashida, Tetsuya, Maruyama, Hirotaka, van Kuijk, Harry, Etoh, Takeharu Goji |
| Předmět: |
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| Zdroj: |
IEEE Transactions on Electron Devices; Apr2012, Vol. 59 Issue 4, p1107-1113, 7p |
| Abstrakt: |
An ultrahigh-speed charge-coupled device (CCD) with an increased dynamic range at a frame rate above 200 kiloframes per second (kfps) was developed. The dynamic range of a CCD operating at extremely high speeds is reduced as a result of rounding of a sharp voltage waveform inside the device. The amount of rounding was estimated by using an equivalent circuit model of one kind of electrodes in a four-phase CCD memory. The simulation showed that the calculated voltage at a quarter period and the measured saturation signal level have similar dependence on the frame rate. To suppress the drop in voltage at a quarter period, the active pixels and the driving circuit were divided, and the resistance of the pixel wiring was reduced. A new ultrahigh-speed CCD, whose active pixels are divided into eight separately driven blocks and that employs dual wirings to each electrode of the four-phase CCD memory, was designed and fabricated. A driving evaluation experiment showed that the ultrahigh-speed CCD had a dynamic range of 48.6 dB at 1 000 000 fps. This range is equivalent to 8-bit digital and is 2.5 times higher than that of a previous ultrahigh-speed CCD. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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