Output buffer with low-voltage devices to driver high-voltage signals for PCI-X applications
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United States of America Patent
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May 16, 2006
Grant Date -
May 19, 2005
app pub date -
Mar 3, 2004
filing date -
Nov 18, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An output buffer circuit with low-voltage devices to driver high-voltage signals for PCI-X applications is proposed. Because power supply voltage of PCI-X is at 3.3V, the high-voltage gate-oxide stress is a serious problem to design PCI-X I/O circuit in a 0.13 .mu.m 1V/2.5V CMOS process with only low-voltage gate oxide. This proposed output buffer circuit can be operated at 133 MHz in 3.3V PCI-X environment without causing high-voltage gate-oxide reliability problem. In this design, the circuit is implemented in a 0.13 .mu.m 1V/2.5V CMOS process and the output signal swing can be 3.3V. Besides, a level converter that converts 0V.about.1V voltage swing to 1V.about.3.3V voltage swing is also presented.
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