Schmitt trigger circuit realized with low-voltage devices for high-voltage signal application
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United States of America Patent
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Issued Date -
May 19, 2005
app pub date -
Mar 3, 2004
filing date -
Nov 18, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to a Schmitt trigger circuit. The proposed Schmitt trigger circuit can receive the high-voltage input signal but it is consisted by only using the low-voltage devices with thin gate oxide. For example, it is implemented in a 0.13 .mu.m 1V/2.5V Complementary Metal-Oxide Semiconductor (CMOS) process. However, it can be operated in the 3.3 V interface environment without causing the high-voltage-induced gate-oxide reliability problem. It is suitable for the I/O interface circuit to receive the high-voltage input signal and to reject the noise.
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