Loopback BIST for NFC RF Front-End Self-Testing
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Solution Overview
Problem
The testing of Near Field Communication (NFC) modes such as card emulation, reader emulation, and peer-to-peer modes in wireless devices is complex and not adequately addressed by existing technologies, requiring costly external Automated Test Equipment (ATE) for Radio Frequency (RF) Integrated Circuits (ICs).
Innovation Solution
Implementing a Built-In-Self-Test (BIST) approach with loop-back techniques within the NFC RF front-end unit, utilizing an NFC antenna driver and digital front-end unit to generate and demodulate signals, allowing for self-testing of NFC modes without external equipment, and emulating NFC card and reader operations to ensure compliance with standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external Automated Test Equipment (ATE) is used to test NFC functionality, then testing accuracy and reliability are improved, but testing cost increases significantly
Solution Approach 1:
The patent implements a Built-In-Self-Test (BIST) mechanism where the NFC device tests itself using internal components. The transmitter generates test signals that loop back through the antenna and receiver, with results evaluated by an evaluation unit within the same device. This eliminates the need for expensive external ATE while maintaining testing reliability through self-diagnosis capabilities.
Solution Approach 2:
The patent extracts the testing function from external equipment and integrates it into the NFC device itself. By removing the dependency on external ATE and implementing on-chip test signal generation, looping, and evaluation, the solution reduces external equipment requirements while maintaining comprehensive NFC functionality testing.
2Reliability
If comprehensive NFC mode testing is implemented, then quality compliance is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal testing mechanism where a single BIST framework can test multiple NFC modes (card emulation, reader emulation, peer-to-peer) using the same transmitter, antenna, receiver, and evaluation unit. This multi-functional approach reduces overall system complexity compared to implementing separate testing systems for each NFC mode.
Solution Approach 2:
The patent combines test signal generation, signal transmission, signal reception, and test result evaluation into a unified on-chip BIST system. By merging these functions into integrated circuitry within the NFC device rather than using separate external testing equipment, the solution reduces system complexity while maintaining comprehensive testing capability.
3Ease of manufacture
If on-chip BIST implementation is used, then testing cost is reduced, but testing capability for complex RF circuits is limited
Solution Approach 1:
The patent uses the antenna as an intermediary element that enables test signals to loop back from the transmitter through the antenna and receiver. This intermediary approach allows the BIST system to test the complete RF signal path including antenna coupling effects, thereby expanding testing capability beyond simple circuit testing to include full NFC communication path validation.
Solution Approach 2:
The patent implements preliminary test signal generation and looping mechanisms within the NFC device before actual NFC operations. By pre-configuring test signal paths and evaluation logic, the system can comprehensively test RF circuit functionality, modulation/demodulation, and antenna performance without requiring external equipment, thereby enhancing testing capability within cost constraints.
Data Source
AI summary
A method of self-test for a near-field communication (NFC) radio frequency (RF) front-end unit comprising one antenna driver and at least one unit from a group comprising one reader and one card emulator, the RF front-end unit being connected to a digital front-end unit, wherein the antenna driver and the unit are interconnected through a first connection line via their respective first input-output interface and are also interconnected through a second connection line via their respective second input-output interface, the digital front-end unit being connected to the second connection line, the method comprising: activating the antenna driver and the unit based on control signals; —generating a first signal onto the first connection line by modulating a respective first bitstream; —retrieving a second bitstream from the second connection line, by demodulating the first signal; and, —determining an outcome of the self-test by monitoring the demodulated signal.