| 摘要 |
<p>A device has N photodiodes PD1 to PDN, and also an intagrating circuit 10n, switch SWn2, capacitor Cn2, intagrating circuit 20n, and sample and hold circuit 30n in correspondence with each photodiode PDn. The device also has a maximum value detection circuit 100, maximum value detection circuit 200, timing control circuit 300, A/D conversion circuit 400, and shift register 500. The maximum value detection circuit 200 outputs a maximum voltage value Vmax2 as a maximum value of signal voltages Vn2 output from the intagrating circuits 20n. The A/D conversion circuit 400 sets its A/D conversion range based on this maximum voltage value Vmax2, and sequentially A/D-converts the signal voltages Vn2. This invention provides a photosensitive device which is never saturated even when the intensity of incident light is large, and can assure high A/D conversion resolution even when the intensity of incident light is small. <IMAGE></p> |
