Transimpedance Amplifier Fault Detection Before Optical Assembly
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Solution Overview
Problem
Testing optical circuits with transimpedance amplifiers is costly due to the expense of optical components, leading to waste when faults are detected post-assembly.
Innovation Solution
Incorporating an injection circuit that generates electrical test signals to test the transimpedance amplifier and its connections before assembly, allowing for fault detection without discarding expensive optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical components are used in transimpedance amplifier circuits, then the circuit functionality is improved, but the testing cost increases and waste occurs when faults are detected post-assembly
Solution Approach 1:
The patent applies preliminary action by performing fault detection on the transimpedance amplifier circuit before assembling expensive optical components. The system uses electrical test signals to simulate optical signal behavior and test the amplifier's functionality in advance, ensuring that optical components are only assembled into verified working circuits, thus preventing waste.
2Reliability
If optical components are assembled into the circuit before testing, then the complete circuit functionality is achieved, but fault detection becomes costly and wasteful
Solution Approach 1:
The system performs preliminary testing of the transimpedance amplifier using electrical signals before optical component assembly. This early detection capability allows the system to identify faults in the electronic circuitry without requiring optical components, preventing the waste of expensive optical parts that would otherwise be discarded upon fault detection after assembly.
3Loss of substance
If electrical test signals are injected before assembly, then waste is reduced, but additional testing equipment and complexity are required
Solution Approach 1:
The system achieves multi-functionality by using electrical test signals that simulate optical signal behavior, allowing the same transimpedance amplifier circuit to be tested with both electrical and optical signals. The testing equipment can operate in electrical mode before assembly and optical mode after assembly, reducing the need for completely separate testing systems and minimizing added complexity.
Data Source
AI summary
An integrated circuit includes a transimpedance amplifier and an injection circuit. The injection circuit generates a first electrical test signal and injects the first electrical test signal into the transimpedance amplifier. The first electrical test signal or an output of the transimpedance amplifier generated based on the first electrical test signal is used to determine whether the integrated circuit is faulty.