Low and high voltage CMOS devices and process for fabricating same
First Claim
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1. A semiconducting structure comprising:
- a substrate;
a gate oxide extending from a first end to a second end, the gate oxide being disposed on the substratea first thick field oxide extending from the first end of the gate oxide away from the gate oxide;
a second thick field oxide extending from the second end of the gate oxide away from the gate oxide;
a first p+ doped region disposed under the first thick field oxide;
a second p+ doped region disposed under the second thick field oxide;
a first gate disposed over the gate oxide, a first portion of the first gate extending over a portion of the first thick field oxide and a second portion of the first gate extending over a portion of the second thick field oxide.
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Abstract
CMOS devices and process for fabricating low voltage, high voltage, or both low voltage and high voltage CMOS devices are disclosed. According to the process, p-channel stops and source/drain regions of PMOS devices are implanted into a substrate in a single step. Further, gates for both NMOS and PMOS devices are doped with n-type dopant and NMOS gates are self-aligned.
53 Citations
14 Claims
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1. A semiconducting structure comprising:
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a substrate; a gate oxide extending from a first end to a second end, the gate oxide being disposed on the substrate a first thick field oxide extending from the first end of the gate oxide away from the gate oxide; a second thick field oxide extending from the second end of the gate oxide away from the gate oxide; a first p+ doped region disposed under the first thick field oxide; a second p+ doped region disposed under the second thick field oxide; a first gate disposed over the gate oxide, a first portion of the first gate extending over a portion of the first thick field oxide and a second portion of the first gate extending over a portion of the second thick field oxide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification