| 摘要 |
A solid-state image sensing apparatus with a wide dynamic range, and a high performance, and further, a small size, and a low cost and its driving method are provided. A timing generator, before it supplies a reset pulse (134) to a reset gate (128), has a sample hold circuit (2) held an output voltage of a buffer circuit (130). In this reset stage, in case that the amount of incident light to a photo diode (122) is large, electric charges which the photo diode (122) generated overflow from the photo diode (122) and flow into an FD part (123), and further, overflow also in the FD part (124) and flow out to an electric source Vdd. At this time, a voltage of the FD part (124) is determined by a size of a current due to electric charges which flow out to the electric source, but since a current flowing in a channel is small and the reset gate (128) operates in a sub-threshold region, a voltage of the FD part (124) becomes a value which corresponded to logarithm of a current value. Thus, a voltage which the sample hold circuit (2) holds becomes a value which corresponded to logarithm of the amount of light. <IMAGE> |
