LDO/HDO architecture using supplementary current source to improve effective system bandwidth
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United States of America Patent
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Sep 1, 2015
Grant Date -
Jun 12, 2014
app pub date -
Jan 25, 2013
filing date -
Dec 7, 2012
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Abstract
An LDO/HDO circuit adds a supplementary current source to supply the output node. The current boosting section includes a digital comparator with a first input connected to the LDO's feedback loop and a second input connected to a reference level. The comparator then generates a digital output used to control the supplementary current source. This approach also can be used in a far-side implementation, where the local supply level for the load is boosted by the current source based a comparison of this local level and the output of the LDO. Miller capacitive compensation is also considered. Current in shunted to ground from a node in the Miller loop, where the level is controlled by the output of a digital comparator base on a comparison of the circuit's output voltage and a reference level.
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