Parallel Security Traces with Complementary Signals for IC Protection
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Solution Overview
Problem
Existing data security devices face issues with unintended voltage coupling between security traces and underlying circuits, leading to signal distortion and potential tampering, as prior solutions fail to adequately compensate for parasitic capacitance and electromagnetic interference.
Innovation Solution
Implementing a pair of substantially parallel security traces with complementary signal patterns, where one trace is driven with a signal that balances the voltage changes induced in the other, minimizing net induced voltage changes and canceling out induced currents through capacitive coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a single security trace is used to protect underlying circuits, then electromagnetic shielding and physical protection are provided, but unintended voltage coupling and signal distortion occur due to parasitic capacitance
Solution Approach 1:
The patent uses two security traces with asymmetric signal patterns (one active, one inactive) to create balanced electromagnetic fields. The inactive trace carries a complementary signal that cancels the capacitive coupling effects of the active trace, thereby eliminating signal distortion while maintaining shielding effectiveness.
Solution Approach 2:
The inactive security trace acts as a counterweight to the active trace's electromagnetic influence. By driving the inactive trace with a complementary signal, the patent creates opposing electromagnetic fields that neutralize the harmful voltage coupling effects, similar to how counterweights balance forces in mechanical systems.
2Object-affected harmful factors
If security traces are placed close to underlying circuits for effective shielding, then electromagnetic protection is enhanced, but capacitive coupling and signal interference increase
Solution Approach 1:
The patent converts the harmful capacitive coupling effect into a beneficial shielding mechanism. By intentionally placing security traces close to circuits and driving them with complementary signals, the patent transforms the coupling effect from a source of interference into a source of electromagnetic shielding that protects against external threats.
Solution Approach 2:
The patent changes the electrical parameters of the security traces by applying complementary voltage signals to the active and inactive traces. This parameter change transforms the traces from potential sources of interference into coordinated electromagnetic shields that cancel each other's harmful effects while maintaining protective functionality.
3Reliability
If an active security trace layer is used to detect tampering, then security monitoring is improved, but induced currents in adjacent circuits cause signal distortion
Solution Approach 1:
The patent segments the security trace function into two separate traces: an active trace for tamper detection and an inactive trace for compensating electromagnetic effects. This segmentation allows each trace to perform its specific function independently while working together to eliminate the harmful side effects of capacitive coupling.
Solution Approach 2:
The inactive security trace acts as an intermediary that mediates between the active security trace and the underlying circuits. It absorbs and cancels the electromagnetic interference that would otherwise directly couple into the circuits, thereby protecting signal integrity while maintaining security monitoring capabilities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively prevents signal distortion and tampering by ensuring that any induced currents are substantially canceled out, maintaining the integrity of the underlying circuit signals and enhancing security against unauthorized access.
Implementation Method 1
The changing potential of the security trace will cause a current to flow in any adjacent trace via capacitive coupling. The current induced in an adjacent circuit is given by the equation I=C dv/dt
Implementation Method 2
The pattern generator produces a voltage change in the second security trace that is substantially complementary to the voltage change in the first security trace... minimizing net induced voltage changes and canceling out induced currents through capacitive coupling
Data Source
AI summary
An integrated circuit (IC) security apparatus with complementary security traces and a method for producing such an apparatus is disclosed. The security apparatus comprises a pattern generator, and a plurality of security traces. The arrangement of security trace pairs are such that the second trace is arranged substantially parallel to the first trace. The pattern generator produces two signals, a second signal, which is applied to the second trace, is substantially complimentary to the first security trace. The timing and amplitude of the second (complimentary) signal is developed such that any net induced currents are substantially nulled. One or more of the signals is received from the signal generator and compared to the same signal after it is conducted through a security trace. The results are analyzed to determine if the security of the IC has been breached.