MOSFET temperature compensation current source
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United States of America Patent
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-
Apr 15, 2008
Grant Date -
Sep 28, 2006
app pub date -
Mar 10, 2006
filing date -
Mar 11, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A current source generates a constant current using metal oxide semiconductor (MOS) transistors. A biasing circuit generates a biasing current based on the transconductance of the MOS transistors. A load circuit, comprising a resistor coupled in parallel with a MOS transistor, generates a constant load current from the biasing current. The load current comprises the sum of a resistor current, which flows through the resistor, and a MOS current that flows through the transistor. The load current is constant because variations of the resistor current offset variations of the MOS current across temperature or process variations. A current mirror circuit generates an output current for the current source equal to a sum of the resistor current and the MOS current, the output current being approximately constant in value across temperature or process variations.
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