VOLTAGE CALIBRATION CIRCUIT CAPABLE OF UPDATING VOLTAGE TO BE CALIBRATED AUTOMATICALLY
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United States of America Patent
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Apr 27, 2017
app pub date -
Jan 6, 2016
filing date -
Oct 27, 2015
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Abstract
A voltage calibration circuit includes a voltage output circuit, an amplifier, a notification circuit, and a built-in self-test circuit. The voltage output circuit selects a first voltage source to output an output voltage according to a selection signal. Two input terminals of the amplifier are for receiving the output voltage and a reference voltage corresponding to the first voltage source respectively. The notification circuit outputs a notification signal according to the reference voltage, a voltage at an output terminal of the amplifier and an indication voltage. The indication voltage and the output voltage have a fixed voltage difference. The built-in self-test circuit updates the selection signal according to the notification signal so that the voltage output circuit can select a second voltage source accordingly.
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