Image sensor and electronic camera
摘要
說明書
The first electric current source 25 is connected to the individual pixels 10 via the first vertical signal line VL1, whereas the second electric current source 26 is connected to the individual pixels 10 via the second vertical signal line VL2. The first electric current source 25 and the second electric current source 26 each generate an electric current used to read out signals from each of the pixels 10. The first electric current source 25 provides an electric current having been generated therein to the first vertical signal line VL1 and to the first selection unit 16 and the amplifier unit 15 in each pixel 10. Likewise, the second electric current source 26 provides an electric current having been generated therein to the second vertical signal line VL2 and to the second selection unit 17 and the amplifier unit 15 in each pixel 10. It is to be noted that the electric current provided from the first electric current source 25 and the electric current provided from the second electric current source 26 assume values substantially equal to each other.
The arithmetic unit 50, which is configured so as to include an amplification unit 60, capacitors 51, 52 and 53 and switches SW1, SW2 and SW3, executes an arithmetic operation so as to add together a signal input to the capacitor 51 and a signal input to the capacitor 52. ON/OFF control of the switches SW1, SW2 and SW3, each constituted with a transistor, is executed by the vertical control unit 70.
