17543701. DIGITAL LOGIC LOCKING OF ANALOG CIRCUITS simplified abstract (INTERNATIONAL BUSINESS MACHINES CORPORATION)

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DIGITAL LOGIC LOCKING OF ANALOG CIRCUITS

Organization Name

INTERNATIONAL BUSINESS MACHINES CORPORATION

Inventor(s)

Effendi Leobandung of Stormville NY (US)

DIGITAL LOGIC LOCKING OF ANALOG CIRCUITS - A simplified explanation of the abstract

This abstract first appeared for US patent application 17543701 titled 'DIGITAL LOGIC LOCKING OF ANALOG CIRCUITS

Simplified Explanation

The patent application describes an analog circuit that has two selectable resistances, which can be set to match each other within a designed ratio and tolerance in an unlocked state. However, in a locked state, the resistances do not match. A controller retrieves a logic lock key from an off-chip memory and uses it to select the resistances, thereby setting the circuit to its unlocked state.

  • The analog circuit has two selectable resistances that can be set to match each other within a designed ratio and tolerance.
  • In the unlocked state, the resistances are set to match each other, while in the locked state, they do not match.
  • A controller retrieves a logic lock key from an off-chip memory to select the resistances and set the circuit to its unlocked state.

Potential Applications

  • This technology can be used in electronic devices that require secure access control, such as smart cards, secure communication systems, or authentication systems.
  • It can also be applied in systems that need to protect sensitive information or prevent unauthorized access, such as secure storage devices or secure sensors.

Problems Solved

  • The technology provides a secure method for controlling access to an analog circuit by using a logic lock key.
  • It ensures that the circuit remains locked unless the correct logic lock key is provided, preventing unauthorized access or tampering.

Benefits

  • The analog circuit can be securely locked and unlocked using the logic lock key, providing a high level of access control.
  • The ability to set the resistances within a designed ratio and tolerance ensures accurate and reliable operation of the circuit.
  • The technology can be easily integrated into existing electronic systems, providing an additional layer of security without significant modifications.


Original Abstract Submitted

An analog circuit has a first plurality of transistors that are connected as a first selectable resistance in the analog circuit, and a second plurality of transistors that are connected as a second selectable resistance in the analog circuit. In an unlocked state of the analog circuit, the first selectable resistance matches the second selectable resistance within a designed ratio and tolerance. In a locked state of the analog circuit, the first selectable resistance and the second selectable resistance do not match within the designed ratio and tolerance. A controller retrieves a logic lock key from an off-chip memory and selects the first and second selectable resistances, thereby setting the analog circuit to its unlocked state, by sending respective first and second portions of the logic lock key to operate the first and second pluralities of transistors.

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