Circuit and method for powering up an integrated circuit and an integrated circuit utilizing same
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United States of America Patent
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Aug 28, 2012
Grant Date -
Aug 23, 2007
app pub date -
Feb 21, 2006
filing date -
Feb 21, 2006
priority date (Note) -
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Abstract
The present invention is a circuit and method for providing a reference voltage and/or one or more circuit/circuit-block enabling signals for an IC. As the voltage level on a power supply line ramps upward towards or above a nominal operating voltage, a first threshold voltage detector circuit segment may be activated and may begin to generate a bandgap reset signal once the voltage level of the power supply reaches a first threshold voltage level. The bandgap reset signal may trigger the power-up and operation of a bandgap reference circuit segment, and according to further embodiments of the present invention, a second threshold voltage detector circuit segment, which second threshold voltage detector circuit segment may be matched with the first voltage detector circuit, may generate a voltage reset signal indicating that the bandgap reference source is powering-up. Once the supply voltage reaches a third threshold reference voltage, the first detector may disable the bandgap reset.
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