Method for forming a BiCMOS integrated circuit with Nwell compensation implant and method
First Claim
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1. A method of fabricating a BiCMOS circuits, comprising the steps of:
- forming a plurality of Nwell regions in a semiconductor substrate;
forming a plurality of isolation regions to electrically isolate at least some of the Nwell regions;
forming MOS transistors in a first subset of said plurality of Nwell regions;
forming extrinsic and intrinsic base regions of bipolar transistors in a second subset of Nwell regions; and
implanting a p-type dopant in at least some of said second subset of Nwell regions to form lightly doped collector regions in at least some of the bipolar transistors.
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Abstract
A BiCMOS integrated circuit with Nwell compensation implants and a method for fabricating the same is disclosed. In accordance with the method of fabricating a BiCMOS integrated circuit, a plurality of Nwell regions are created in a semiconductor substrate. At least some of the Nwell regions comprise lightly doped collector regions of bipolar transistors while others of the Nwell regions comprise Nwell regions of MOS transistors. A plurality of isolation regions are created to electrically isolate at least some of the Nwell regions. A p-type dopant is implanted in at least some of the lightly doped collector regions of the bipolar transistors.
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Citations
12 Claims
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1. A method of fabricating a BiCMOS circuits, comprising the steps of:
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forming a plurality of Nwell regions in a semiconductor substrate; forming a plurality of isolation regions to electrically isolate at least some of the Nwell regions; forming MOS transistors in a first subset of said plurality of Nwell regions; forming extrinsic and intrinsic base regions of bipolar transistors in a second subset of Nwell regions; and implanting a p-type dopant in at least some of said second subset of Nwell regions to form lightly doped collector regions in at least some of the bipolar transistors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of fabricating a BiCMOS circuits, comprising the steps of:
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forming a plurality of Pwell regions in a semiconductor substrate; forming a plurality of isolation regions to electrically isolate at least some of the Pwell regions; forming MOS transistors in a first subset of said plurality of Pwell regions; forming extrinsic and intrinsic base regions of bipolar transistors in a second subset of Pwell regions; and implanting a n-type dopant in at least some of said second subset of Pwell regions to form lightly doped collector regions in at least some of the bipolar transistors.
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Specification