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US 9,431,353 B2Granted
Method for manufacturing a digital circuit and digital circuit
AssigneeInfineon Technologies AG
InventorsThomas Kuenemund, Berndt Gammel
Life of this patent
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Abstract
A method for manufacturing a digital circuit is described comprising forming two field effect transistors, connecting the field effect transistors such that an output signal of the digital circuit in response to a predetermined input has an undefined logic state when the threshold voltages of the field effect transistors are equal and setting the threshold voltages of at least one of the field effect transistors such that the output signal of the digital circuit in response to the predetermined input has a predetermined defined logic state.
Claims22
A method for manufacturing a digital circuit comprising:
- forming a plurality of circuits having the same physical layout, each circuit comprising two field effect transistors;
- for each circuit, connecting the field effect transistors such that an output signal of the digital circuit in response to a predetermined input has an undefined logic state when the threshold voltages of the field effect transistors are equal;
- and
- for each circuit, setting the threshold voltages of at least one of the field effect transistors such that the output signal of the circuit in response to the predetermined input has a predictably determined logic state
- wherein for a first subset of the circuits the predictably determined logic state is 1 and for a second subset of the circuits the predictably determined logic state is 0 and
- wherein for each circuit the predictably determined logic state is set to be equal to a bit of a binary vector to be secretly stored and read out in response to the predetermined input.
3 more elements
Dependencies are inferred from the claim text.