Current source circuit having a dual loop that is insensitive to supply voltage
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United States of America Patent
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Issued Date -
Mar 27, 2008
app pub date -
Sep 25, 2006
filing date -
Sep 25, 2006
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Abandoned
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Abstract
A current source circuit having dual feedback paths that is insensitive to supply voltage includes a first current mirror having a first PMOS transistor and a second PMOS transistor. A second current mirror cascodes with the first current mirror including a first NMOS transistor and a second NMOS transistor. The first current mirror and the second current mirror are respectively coupled to a third PMOS transistor and a third NMOS transistor. The third PMOS transistor, the third NMOS transistor and the second PMOS transistor and the second NMOS transistor form a positive feedback path. The third PMOS transistor, the third NMOS transistor and the first PMOS transistor and the first NMOS transistor form a negative feedback path. A gain of the negative feedback path is larger than the gain of the positive feedback path. In this way, an overall gain of the current source is effectively enhanced.
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