Maintaining the resistor divider ratio during start-up
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United States of America Patent
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Jun 21, 2016
Grant Date -
Oct 29, 2015
app pub date -
Jul 8, 2015
filing date -
Jan 25, 2013
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Abstract
Circuits and methods to maintain a resistive voltage divider ratio during start-up of an electronic circuit comprising a feed-forward capacitor across a feedback resistor using a dynamic start-up circuit are disclosed as e.g. a LDO or an amplifier. In a preferred embodiment of the disclosure is applied to an LDO. Modification of the resistive voltage divider ratio caused by the feed-forward capacitor during start-up is prevented while the voltage level of a voltage access point of the voltage divider on the feed-forward capacitor is maintained. A start-up circuit comprises a start-up capacitor and a start-up comparator.
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