Whole-chip ESD protection scheme for CMOS mixed-mode IC´s in deep-submicron CMOS technology

A whole-chip ESD protection scheme with the ESD-connection diodes and a substrate-triggering field-oxide device (STFOD) are proposed to protect mixed-mode CMOS IC´s against ESD damage. The STFOD is triggered on by the substrate-triggering technique to make an area-efficient VDD-to-VSS ESD clamp circuit. The ESD-connection diodes provide the current discharging paths among the multiple separated power lines to avoid the ESD damage located at the digital-analog interface. This whole-chip ESD protection scheme has been practically verified in an L-bits DAC chip in a 0.6-μm CMOS process with a pin-to-pin ESD robustness of above 4 KV