Image sensor and electronic camera
摘要
說明書
The capacitor 51 is a capacitor (input capacitor), one terminal of which is connected to the first vertical signal line VL1 via the switch SW1 and another terminal of which is connected to an input terminal 62 of the amplification unit 60. The capacitor 52 is a capacitor (input capacitor), one terminal of which is connected to the second vertical signal line VL2 via the switch SW2 and another terminal of which is connected to the input terminal 62 of the amplification unit 60. In addition, the capacitor 53 is a capacitor (feedback capacitor), one terminal of which is connected to the input terminal 62 of the amplification unit 60 and another terminal of which is connected to an output terminal 63 of the amplification unit 60. The capacitor 53 assumes a capacitance value C, whereas the capacitors 51 and 52 each assume a capacitance value that is half the capacitance value C, i.e., ? C. A reference signal Vref sustaining a constant voltage is input to an input terminal 61 of the amplification unit 60.
The arithmetic unit 50 outputs, from the output terminal 63, a signal obtained by adding together the signal input to the capacitor 51 and the signal input to the capacitor 52 and averaging these signals. Namely, the arithmetic unit 50 is an adding unit 50 that adds together a plurality of signals input thereto. The signal output from the arithmetic unit 50 first undergoes signal processing via an analog/digital conversion unit (A/D conversion unit) and the like (not shown) and is then output to the control unit 4 of the camera 1.
