| 摘要 |
PURPOSE:To obtain a high S/N ratio which is the same as the ratio of a static operation by connecting 2nd electrode in common with 3rd electrode. CONSTITUTION:A sensor power source VS is connected to a drain electrode D and a gate electrode G is connected in common with a source electrode S. A storage capacitor C is connected to the source electrode S and further a load resistor RL is connected to the source electrode S through a transfer switch SW. When the transfer switch S is switched from ON to OFF, a photocurrent iS is applied to the capacitor C and the charging of the capacitor C is started. Along with the progress of the charging, voltage VC increases. On the other hand, as the gate electrode G is connected in common with the source electrode S, the voltage >=VGS is always zero. Therefore, a transient photocurrent is not applied when the transfer switch SW is ON.
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