Digital Fingerprint Circuit Using Jitter Feedback for IoT Stability

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Solution Overview

Problem

The increasing number of IoT devices requires more secure communication methods, and existing digital fingerprint technologies based on physically unclonable functions (PUF) struggle to maintain uniqueness under varying temperature and voltage conditions, necessitating a robust and reliable digital fingerprint generation solution.

Innovation Solution

A digital fingerprint generation circuit comprising a pulse generation sub-circuit, digital control oscillator sub-circuit, frequency dividing sub-circuit, frequency and phase detection sub-circuit, and control sub-circuit, which generates a unique digital fingerprint by analyzing the inherent jitter in input and feedback signals, ensuring consistency across different operating conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If PUF-based digital fingerprint technology is used, then device uniqueness is achieved, but reliability under varying temperature and voltage conditions deteriorates

Engineering Contradiction:

Improvefingerprint consistencyVSAvoidenvironmental condition sensitivity

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent implements a feedback mechanism where the generated fingerprint is compared against reference values, and the system adjusts its operation to maintain consistency. The frequency and phase detection sub-circuit continuously monitors the relationship between input and feedback signals, enabling real-time compensation for environmental variations.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically adjusts operating parameters such as frequency control signals based on detected environmental conditions. By changing parameters like oscillator frequency and pulse timing, the system compensates for temperature and voltage variations to maintain fingerprint reliability.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If complex frequency control and detection circuits are added to improve fingerprint stability, then reliability improves, but device complexity increases

Engineering Contradiction:

Improvefingerprint stabilityVSAvoidcircuit structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines multiple functions into integrated sub-circuits. The frequency and phase detection sub-circuit simultaneously performs both frequency division and phase comparison, while the control sub-circuit integrates frequency adjustment and timing control functions, reducing overall system complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The detection sub-circuit serves multiple purposes: it detects frequency relationships, measures phase differences, generates control signals, and validates fingerprint consistency. This multi-functionality reduces the need for separate dedicated circuits for each function.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11777541B2Digital fingerprint generation circuit, generation method and electronic device

Publication Date: 2023.10.03 BEIJING BOE TECH DEV CO LTD

AI summary

Embodiments of the present disclosure provide a circuit and a method for digital fingerprint generation, and an electronic device. The digital fingerprint generation method includes inputting an input signal from outside; generating a frequency relationship indication signal between an input signal and a feedback signal; generating a frequency control signal based on the frequency relationship indication signal; generating an intermediate signal based on a frequency control signal and pulse signals; dividing the intermediate signal in frequency to generate the feedback signal; and generating a digital fingerprint based on the input signal and the feedback signal.