Multi-level output cascode power stage
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United States of America Patent
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May 1, 2018
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app pub date -
Oct 25, 2013
filing date -
Jul 25, 2013
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Abstract
A power stage to generate an output voltage at one of a high reference voltage, an intermediate reference voltage and a low reference voltage, including a first switch stage connecting the output terminal to the high reference voltage, comprising a pair of transistors connected in series along their source-to-drain paths, a first transistor coupled to the output terminal and having its gate biased at the intermediate voltage, a second transistor having a gate that receives a first stage control signal that varies between the high reference voltage and the intermediate reference voltage, a second switch stage connecting the output terminal to the intermediate reference voltage, having a gate that receives a second stage control signal that varies among the high reference voltage, intermediate reference voltage and low reference voltage, a third switch stage connecting the output terminal to the low reference voltage, having a pair of transistors connected in series along their source-to-drain paths, a first transistor coupled to the output terminal and having its gate biased at the intermediate voltage, a second transistor having a gate that receives a third stage control signal that varies between the intermediate reference voltage and the low reference voltage.
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