Porting a circuit design from a first semiconductor process to a second semiconductor process
First Claim
1. A method of fabricating an integrated circuit comprising:
- producing a second transistor circuit design based on a first transistor circuit design, the second transistor circuit design having target transistors, the target transistors including a plurality of deeply depleted channel (DDC) transistors, the second design having an initial threshold voltage value assigned to each of the target transistors;
determining targets defining a set of design constraints;
solving objective functions with the set of design constraints to produce optimized threshold voltage values for each of the target transistors;
selectively doping a semiconductor substrate to form a plurality of highly-doped screening regions over which a corresponding plurality of transistor gates will respectively be formed;
selectively doping the semiconductor substrate in regions that are associated with the target transistors to dopant concentrations that set the threshold voltage values for each of the target transistors to a desired range of values; and
forming an undoped semiconductor layer above the highly doped screening region.
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Accused Products
Abstract
Porting a first integrated circuit design targeted for implementation in a first semiconductor manufacturing process, and implementing a second circuit design in a second semiconductor manufacturing process wherein the electrical performance of the second integrated circuit meets or exceeds the requirements of the first integrated circuit design even if the threshold voltage targets of the second integrated circuit design are different from those of the first integrated circuit design; and wherein physical layouts, and in particular the gate-widths and gate-lengths of the transistors, of the first and second integrated circuit designs are the same or substantially the same. The second integrated circuit design, when fabricated in the second semiconductor manufacturing process and then operated, experiences less off-state transistor leakage current than does the first integrated circuit design, when fabricated in the first semiconductor manufacturing process, and then operated. Porting includes determining processing targets for the second semiconductor manufacturing process.
518 Citations
18 Claims
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1. A method of fabricating an integrated circuit comprising:
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producing a second transistor circuit design based on a first transistor circuit design, the second transistor circuit design having target transistors, the target transistors including a plurality of deeply depleted channel (DDC) transistors, the second design having an initial threshold voltage value assigned to each of the target transistors; determining targets defining a set of design constraints; solving objective functions with the set of design constraints to produce optimized threshold voltage values for each of the target transistors; selectively doping a semiconductor substrate to form a plurality of highly-doped screening regions over which a corresponding plurality of transistor gates will respectively be formed; selectively doping the semiconductor substrate in regions that are associated with the target transistors to dopant concentrations that set the threshold voltage values for each of the target transistors to a desired range of values; and forming an undoped semiconductor layer above the highly doped screening region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An integrated circuit structure comprising:
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a plurality of target transistors configured in a second transistor circuit design based on a first transistor circuit design, the plurality of target transistors including a plurality of deeply depleted channel (DDC) transistors, the second transistor circuit design having an initial threshold voltage value assigned to each one of the plurality of target transistors; wherein the each target transistor of the plurality of target transistors has a functional target defined by a set of design constraints, and the initial threshold voltage value is specified by a solution of objective functions within the design constraints; a semiconductor substrate having a plurality of highly-doped screening regions each one under a corresponding one of a plurality of target transistor gates; a portion of the plurality of highly-doped screening regions further comprising doped regions configured to set the threshold voltage value for each of the target transistors; an undoped semiconductor layer formed above the highly doped screening region. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification