OPAMP-less bandgap voltage reference with high PSRR and low voltage in CMOS process
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United States of America Patent
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Jun 15, 2010
Grant Date -
Sep 18, 2008
app pub date -
Mar 14, 2008
filing date -
Mar 16, 2007
priority date (Note) -
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Abstract
A circuit includes an OPAMP-less bandgap voltage generating core circuit connected between a regulated voltage and a ground reference to generate an output bandgap voltage. A preregulator circuit generates the regulated voltage from an unregulated supply voltage. The preregulator circuit includes a negative feedback loop operable to stabilize the regulated voltage and a current source operable to source current for the regulated voltage, the current source mirroring a PTAT current of the OPAMP-less bandgap voltage generating core circuit. The core circuit further includes a negative feedback loop and a positive feedback loop, the negative and positive feedback loops functioning to equalize two internal voltages within the core.
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