Constant current source circuit
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United States of America Patent
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Sep 19, 2017
Issued Date -
N/A
app pub date -
Oct 5, 2015
filing date -
Oct 2, 2007
priority date (Note) -
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Abstract
One current source includes a first transistor including a drain connected to an output terminal, and a source directly connected to a first power supply, a second transistor including a drain connected to a gate, the gate of the second transistor being connected to the gate of the first transistor, and a source directly connected to the first power supply, a third transistor opposite the first channel type including a drain connected to the drain of the second transistor, a fourth transistor including a drain connected to the source of the third transistor, a gate connected to a first bias voltage, and a source directly connected to second power supply voltage, and a control voltage generator that detects an output voltage on the output terminal and provides a shifted version of the output voltage to the gate of the third transistor.
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