The time delay integration charge coupled device (TDI CCD) is the key component in remote sensing systems.The paper analyzes thc structure and the working principles of the device according to a customized TDI CCD chip.Employing the special clock resources and large-scale phase locked logic (PLL) in field-programmable gate arrays (FPGA),a timingdriven approach is proposed,using which all timing signals including reset gate,horizontal and vertical timing signals,are implemented in one chip.This not only reduces printed circuit board (PCB) space,but also enhances the portability of the system.By studying and calculating CCD parameters thoroughly,load capacity and power consumption,package,etc,are compared between various candidates chips,and detailed comparison results are also listed in table.Experimental results show that clock generator and driving circuit satisfy the requirements of high speed TDI CCD.