Patent ID: 8723098
Filing Date: 2014-05-13
Classification: H01L,H04N

Abstract:
1. A method for transferring charge packets from a plurality of photodetectors to vertical CCD shift registers in a CCD image sensor, wherein a plurality of gate electrodes are disposed over the vertical CCD shift registers and the plurality of gate electrodes are divided into distinct repeating groups of gate electrodes, the method comprising: applying at a first time step an intermediate clock signal having a first voltage level to a fraction of the gate electrodes in each distinct repeating group of gate electrodes; and transferring charge packets from a fraction of the photodetectors to respective vertical CCD shift registers by applying at a second time step a transfer clock signal having a different second voltage level to a fraction of the gate electrodes clocked by the intermediate clock signal at the first time step and applying an accumulation clock signal having a different third voltage level to the remaining portion of the gate electrodes clocked by the intermediate clock signal at the first time step such that a voltage transition on the gate electrodes clocked by the accumulation clock signal substantially compensates a voltage transition on the gate electrodes clocked by the transfer clock signal.