Resistive structure integrated in a semiconductor substrate
First Claim
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1. A resistive structure integrated in a semiconductor substrate, comprising:
- a trench lined with dielectric material to form a dielectric trench; and
a polysilicon region, at least a portion of which is doped, the polysilicon region completely surrounded by the dielectric trench so that the resistive structure is isolated electrically from other components jointly integrated in the semiconductor substrate, and wherein portions of the dielectric trench are formed with a plurality of trenches distributed about the polysilicon region to form a single dielectric region having a width that increases along the resistive structure in which a voltage drop increases.
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Abstract
A resistive structure integrated in a semiconductor substrate and having a suitably doped polysilicon region that is completely surrounded by a dielectric region so that the resistive structure is isolated electrically from other components jointly integrated in the semiconductor substrate.
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Citations
28 Claims
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1. A resistive structure integrated in a semiconductor substrate, comprising:
- a trench lined with dielectric material to form a dielectric trench; and
a polysilicon region, at least a portion of which is doped, the polysilicon region completely surrounded by the dielectric trench so that the resistive structure is isolated electrically from other components jointly integrated in the semiconductor substrate, and wherein portions of the dielectric trench are formed with a plurality of trenches distributed about the polysilicon region to form a single dielectric region having a width that increases along the resistive structure in which a voltage drop increases. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- a trench lined with dielectric material to form a dielectric trench; and
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9. An integrated resistive structure, comprising:
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at least one trench formed in a semiconductor substrate to have a depth greater than a depletion region;
a dielectric layer formed of a dielectric oxide entirely coating all walls of the at least one trench; and
a polysilicon region filling the at least one trench to be isolated dielectrically from the semiconductor substrate, the polysilicon region having at least a portion that is doped. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A resistive structure integrated in a semiconductor substrate, comprising:
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a trench having a depth greater than a width and lined with dielectric material to form a dielectric trench, the dielectric trench formed with a plurality of trenches distributed to form a single dielectric region having a width that increases along the resistive structure where a voltage drop increases; and
a polysilicon region, at least a portion of which is doped, filling the dielectric trench to be surrounded by the dielectric material.
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17. A resistive structure integrated in a semiconductor substrate, comprising:
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a trench having a depth greater than a width and aligned with dielectric material to form a dielectric trench, the dielectric trench formed with a plurality of trenches distributed to form a single dielectric region having a width that increases along the resistive structure where a voltage drop increases; and
a polysilicon region filling the dielectric trench to be surrounded by the dielectric material, the polysilicon region comprising two deposited layers of polysilicon, only a first of the layers enhanced by implantation to lower the values of parasitic capacitances associated with the resistive structure.
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18. A resistive structure integrated in a semiconductor substrate, comprising:
a trench lined with dielectric material to form a dielectric trench; and
a polysilicon region, at least a portion of which is doped, the polysilicon region completely surrounded by the dielectric trench to electrically isolate the dielectric trench from other components jointly integrated in the semiconductor substrate, the polysilicon region formed to have a t-shaped structure providing connection paths of polysilicon.- View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. An integrated resistive structure, comprising:
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at least one trench formed in a semiconductor substrate and having a depth greater than a depletion region;
a dielectric layer entirely coating all walls of the at least one trench; and
a polysilicon region filling the at least one trench to be isolated dielectrically from the semiconductor substrate, the polysilicon region having a t-shaped cross-sectional configuration with a stem portion filling the at least one trench and a cap portion covering the at least one trench and overlapping a portion of a top surface of the silicon substrate on each side of the at least one trench, the polysilicon region having at least a portion that is doped.
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27. An integrated resistive structure, comprising:
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at least one trench formed in a semiconductor substrate;
a dielectric layer entirely coating all walls of the at least one trench; and
a polysilicon region comprising first and second layers of polysilicon filling the at least one trench, the second layer being undoped and the first layer implanted with a dopant. - View Dependent Claims (28)
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Specification