SERIES REGULATOR AND SEMICONDUCTOR INTEGRATED CIRCUIT
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United States of America Patent
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Dec 7, 2017
app pub date -
Apr 6, 2017
filing date -
Jun 2, 2016
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Abstract
The series regulator has: a differential amplifier; a level shifter including a level shift transistor with a drain connected to a gate; and a source follower including an output transistor. The differential amplifier includes an amplification stage having a non-inverting input terminal for input of a reference voltage, an inverting input terminal for input of a feedback voltage, and an amplifier output terminal. The differential amplifier has a DC operation point where an error of an output voltage at the amplifier output terminal to an input voltage to the non-inverting input terminal is equal to or under a gate-source voltage of an input transistor, and a follower output terminal of the source follower is feedback-connected to the inverting input terminal. The level shifter performs a level shift to make an output voltage of the source follower coincident with the voltage at the amplifier output terminal of the differential amplifier.
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