System and method for breakdown protection in start-up sequence with multiple power domains
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United States of America Patent
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Jun 24, 2008
Grant Date -
Apr 27, 2006
app pub date -
Jun 20, 2005
filing date -
Oct 25, 2004
priority date (Note) -
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Abstract
During start-up of a circuit having a high voltage supply and a low voltage supply, a backup bias generator (BBG) is used to avoid burnout and exceeding a breakdown voltage. The high voltage supply is powered on before the low voltage supply. The BBG generates bias in response to the high voltage supply being powered on. Once the low voltage supply is powered on and is stable, the BBG is shut down so that it does not interfere with normal operation of the circuit. The circuit can be separated into high and low supply domains without breakdown issues during power start-up, allowing for power and area optimization.
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