Level-shift circuits compatible with multiple supply voltage
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United States of America Patent
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Apr 17, 2018
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May 3, 2016
filing date -
Oct 15, 2013
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Abstract
A level-shift circuit, receiving a supply voltage and a input signal, includes a pre-stage voltage conversion circuit and a post-stage voltage conversion circuit. The pre-stage voltage conversion circuit includes a first voltage protection module generating an inner conversion voltage and a first voltage conversion module converting the input signal into a pre-stage output signal according to the inner conversion voltage. The post-stage voltage conversion circuit includes a second voltage protection module generating a first inverse output signal, a first output signal, a second inverse output signal, and a second output signal. The transistors of the pre-stage voltage conversion circuit and the post-stage voltage conversion circuit have a punch-through voltage. The level-shift makes the stress of the transistors less than the punch-through voltage when the supply voltage is greater than the punch-through voltage, and remains the driving capability when being less than the punch-through voltage.
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