FET pair based physically unclonable function (PUF) circuit with a constant common mode voltage
AssigneeInternational Business Machines Corporation
InventorsHoward H. Chi, Haitao O. Dai, Kai D. Feng, Donald J. Papae
Life of this patent
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Abstract
A FET pair based physically unclonable function (PUF) circuit with a constant common mode voltage and methods of use are disclosed. The circuit includes a first n-type field effect transistor (NFET) and a second NFET. The circuit also includes a first load resistor coupled to the first NFET by a first p-type field effect transistor (PFET) and a second load resistor coupled to the second NFET by a second PFET. The circuit further comprises a closed loop, wherein the closed loop creates a constant common mode voltage.
Claims18
A structure, comprising:
- a physically unclonable function (PUF) sensor array;
- and
- a differential amplifier coupled to the PUF sensor array,
- wherein the differential amplifier coupled to the PUF sensor array creates a closed loop circuit;
- and
- wherein the closed loop comprises the differential amplifier coupled to a connection point of a plurality of resistors, and the plurality of resistors are coupled to each other such that the connection point of the plurality of resistors form a common mode voltage.
A structure, comprising:
- a physically unclonable function (PUF) sensor array, wherein the PUF sensor array has a constant common mode voltage, which reduces voltage variations and improves reliability of an output of the PUF sensor array;
- and
- a differential amplifier coupled to the PUF sensor array, wherein the differential amplifier coupled to the PUF sensor array creates a closed loop circuit.
A circuit, comprising:
- a first n-type field effect transistor (NFET);
- a second NFET;
- a first load resistor coupled to the first NFET by a first p-type field effect transistor (PFET);
- a second load resistor coupled to the second NFET by a second PFET;
- and
- a closed loop,
- wherein the closed loop creates a constant common mode voltage;
- and
- wherein the closed loop comprises:
- a plurality of voltage followers respectively coupled to a drain of the first NFET by the first PFET and a drain of the second NFET by the second PFET;
- and
- a plurality of resistors connected to a respective output of the plurality of voltage followers, wherein:
- a connection of the plurality of resistors are coupled to each other and is provided to the differential amplifier as a first input;
- and
- a reference voltage is provided to the differential amplifier as a second input.
A method, comprising:
- creating a closed loop circuit;
- driving a common mode voltage to a reference voltage;
- and
- creating a constant common mode voltage,
- wherein creating the constant common mode voltage reduces common mode voltage variations and improves reliability of an output of a physically unclonable function (PUF) sensor.
Dependencies are inferred from the claim text.