Transceiver Loopback Circuit for High-Speed Receiver Defect Testing
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Solution Overview
Problem
Existing serial communication interface circuits face challenges in detecting defects within the receiver component due to limitations in internal loopback testing, particularly at high communication speeds, which can lead to incomplete test coverage and failure to detect defects effectively.
Innovation Solution
A transceiver with an integrated test circuit that performs internal loopback tests, including a resistor ladder and multiplexers, connected to the analog front end, allowing for full-path or part-path testing to enhance defect detection and improve test coverage without disrupting normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal loopback testing is performed in existing serial communication interface circuits, then test coverage is improved, but defect detection capability deteriorates at high communication speeds
Solution Approach 1:
The receiver is divided into separate testable segments including analog front end, deserializer, and logic circuit. Test switches enable selective activation of different test paths (full-path or part-path) to isolate and test specific segments, allowing comprehensive defect detection without requiring complete receiver operation at high speeds.
Solution Approach 2:
A dedicated test circuit is introduced as an intermediary component between the serializer and deserializer. This test circuit generates test data and routes it through the receiver components under test, enabling controlled testing independent of normal high-speed communication operations.
2Measurement precision
If comprehensive internal loopback testing is implemented, then defect detection capability is improved, but device complexity increases
Solution Approach 1:
The test circuit is designed to perform multiple testing functions using shared components. Test switches can route data through different paths (full-path or part-path) and the same analog front end and deserializer are used for both normal operation and testing, reducing the need for entirely separate test hardware.
Solution Approach 2:
Testing functionality is merged with the existing receiver structure. The test circuit integrates with the analog front end, deserializer, and logic circuit rather than requiring completely separate test equipment, thereby reducing overall device complexity while maintaining comprehensive test capability.
3Reliability
If test circuits are integrated into the receiver, then test coverage is improved, but normal operation may be disrupted
Solution Approach 1:
The receiver configuration is made dynamic through test switches that can change the data path routing based on operational mode. During normal operation, the switches route data through the standard receiver path. During testing, the switches reconfigure the path to include test circuits, allowing seamless transition between modes without disrupting either function.
Solution Approach 2:
The testing function is extracted as a separate controllable pathway from the normal data reception path. Test switches enable the test circuit to be connected or disconnected from the main signal flow, allowing comprehensive testing to be performed independently without interfering with normal high-speed communication operations.
Data Source
AI summary
Disclosed is a transceiver which includes a logic circuit that generates parallel transmission data in response to a first test mode signal or a second test mode signal, a serializer that converts the parallel transmission data into serial transmission data, a driver that outputs the serial transmission data through transmission pads, an analog circuit that receives serial reception data through reception pads, a deserializer that converts the serial reception data into parallel reception data, a plurality of test switches switched in response to the first test mode signal, and a test circuit that is electrically connected to the analog circuit through the plurality of test switches and outputs serial post data corresponding to the serial transmission data to the analog circuit.