New Low-Leakage Power-Rail ESD Clamp Circuit in a 65-nm Low-Voltage CMOS Process

A new low-leakage power-rail electrostatic discharge (ESD) clamp circuit designed with consideration of the gate leakage issue has been proposed and verified in a 65-nm low-voltage CMOS process. Consisting of the new low-leakage ESD-detection circuit and the ESD clamp device of a substrate-triggered silicon-controlled rectifier, the new proposed power-rail ESD clamp circuit realized with only thin-oxide (1-V) devices has a very low leakage current of only 116 nA at room temperature (25 degrees C) under the power-supply voltage of 1 V. Moreover, the new proposed power-rail ESD clamp circuit can achieve ESD robustness of over 8 kV, 800 V, and over 2 kV in human-body-model, machine-model, and charged-device-model ESD tests, respectively.