CURRENT SOURCE CIRCUIT AND ELECTRONIC DEVICE
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United States of America Patent
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Issued Date -
Aug 17, 2023
app pub date -
Apr 27, 2021
filing date -
Jun 22, 2020
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Abstract
To improve stability of a reference current in a current source circuit that generates the reference current by using capacitors. The current source circuit includes a pair of capacitors, a switching circuit, an operational amplifier, and an output transistor. The switching circuit charges one of the pair of capacitors with a predetermined charging current, and transfers electric charge from the one of the pair of capacitors to the other of the pair of capacitors. The operational amplifier amplifies a difference between the terminal voltage of the other of the pair of capacitors and a predetermined reference voltage and outputs the difference that has been amplified as an output voltage. The output transistor outputs a current corresponding to the output voltage as a reference current.
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