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Design on Power-Rail ESD Clamp Circuit for 3.3-V I/O Interface by Using Only 1-V/2.5-V Low-Voltage Devices in a 130-nm CMOS Process

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3 Author(s)
M. -D. Ker ; Inst. of Electron., Nat. Chiao Tung Univ. ; W. -Y. Chen ; K. -C. Hsu

A new power-rail electrostatic discharge (ESD) clamp circuit for application in 3.3-V mixed-voltage input-output (I/O) interface is proposed and verified in a 130-nm 1-V/2.5-V CMOS process. The devices in this power-rail ESD clamp circuit are all 1-V or 2.5-V low-voltage nMOS/pMOS devices, which are specially designed without suffering the gate-oxide reliability issue under 3.3-V I/O interface applications. A special ESD detection circuit realized with the low-voltage devices is designed and added in the power-rail ESD clamp circuit to improve ESD robustness of ESD clamp devices by substrate-triggered technique. The experimental results verified in a 130-nm CMOS process have proven the excellent effectiveness of this new proposed power-rail ESD clamp circuit

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IEEE Transactions on Circuits and Systems I: Regular Papers  (Volume:53 ,  Issue: 10 )