Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1998-01-29
2000-03-28
Le, Dinh T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327537, 327309, 327312, 327108, 326 33, 326 34, 326 27, H03K 19003
Patent
active
060437022
ABSTRACT:
Various methods and circuitry for implementing output buffers with low voltage CMOS transistors capable of handling signal overshoot and undershoot conditions at an external terminal are disclosed. The present invention detects the level of the signal at the external terminal and adjusts the voltage at the gate terminals of the output transistors connecting to the external terminal in response thereto, such that oxide stress conditions are alleviated. In one embodiment, dynamic biasing techniques are developed by the present invention to ensure that the circuitry protecting the output devices is itself protected against voltage stress caused by overshoot and undershoot at the external terminal.
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Connor et al., "Dynamic Dielectric Protection for I/O Circuits Fabricated in a 2.5V CMOS Technology Interfacing a 3.3V LVTTL Bus," 1997 Symposium on VLSI Circuits Digest of Technical Papers, pp. 119-120.
Le Dinh T.
Sun Microsystems Inc.
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