| 摘要 |
<p>A transfer channel (13) for transferring charges and a floating diffusion region (33) are formed in a semiconductor substrate. The region (33) receives the charges transferred through the transfer channel (13) and stores them therein. A transfer gates (25, 27) are formed above the transfer channel (13). An output gate electrode (31) is formed above the end portion of the transfer channel (13, 15, 17). The electrode (31) controls the flow of charges from the transfer channel (13, 15, 17) to the floating diffusion region (33). An output section (39) is provided for producing a voltage signal corresponding to the amount of charges stored in the floating diffusion region (33). The output gate electrode (31) is connected to transfer substrate (11) to keep small the output impedance of a circuit for supplying a fixed potential to the output gate electrode (31). Therefore, the product of a capacitance of the gate electrode (31) AC coupled to ground and the output impedance of that circuit is very small. With the very small impedance, the noise induced into the output signal (VOUT) by the clock signals ( phi 1, phi 2) is damped for a short period of time. The output signal (VOUT) is littled influenced by the noise, and therefore the charge transfer device is operable at a high speed.</p> |
