Patent ID: 6600513
Filing Date: 2003-07-29
Classification: G11C,H04N

Abstract:
A charge transfer device, comprising:a floating diffusion amplifier type charge detecting portion containing a reset gate and a reset drain; and a source follower circuit including a detecting transistor having substantially the same potential profile as a potential profile of the reset gate of the charge detecting portion and a load transistor connected to the detecting transistor, wherein an output from the source follower circuit is supplied to the reset drain of the charge detecting portion, a first voltage, which is generated by resistance-dividing a power-supply voltage to be supplied to a drain of the source follower circuit, is commonly applied to each gate of the detecting transistor and the load transistor, a second voltage, which is generated by resistance-dividing the power-supply voltage, is applied to the reset gate of the charge detecting portion via a clamp circuit, whereby the charge transfer device is controlled in such a manner that a reset operation is always performed in an optimum state, irrespective of a variation in a potential under the reset gate.