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ESD protection design for mixed-power domains in 90nm CMOS with new efficient power clamp and GND current trigger (GCT) technique

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1 Author(s)
Okushima, M. ; Core Dev. Div., NEC Electron. Corp., Kawasaki, Japan

This paper presents an ESD protection design scheme for mixed-power domains in narrow ESD design window with ultra-thin gate oxides. Using a grounded gate (gg)NMOS-based clamp with contact ballast (CTB) layout technique, a factor of 3X area reduction can be achieved for MM protection of a 1.6 nm gate oxide compared to a conventional silicide-block ESD scheme. To expand the design window, a novel ground current trigger (GCT) technique using current sensing circuit between different GND busses is proposed. 7 kV HBM and 550 V MM can be achieved with a 2nd clamp with GCT technique, with the same area as a conventional snapback protection device. The GCT technique is also effective for SCR trigger element as cross clamp.

Published in:

Electrical Overstress/Electrostatic Discharge Symposium, 2006. EOS/ESD '06.

Date of Conference:

10-15 Sept. 2006