Copackaged Photodetector and Readout Circuit for Low-Noise LiDAR
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Solution Overview
Problem
Conventional LiDAR systems suffer from noise degradation due to parasitic capacitance and inductance introduced by copper traces connecting separately packaged photodetectors and readout circuits, leading to performance issues such as detection mismatches among channels.
Innovation Solution
A copackaged design where the photodetector and readout circuit are integrated in the same package, connected through direct bonding wires or other routings within the package, minimizing parasitic capacitance and inductance and allowing precise alignment of multiple channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If photodetector and readout circuit are separately packaged and connected through copper traces on PCB, then ease of manufacture is improved, but parasitic capacitance and inductance increase degrading signal detection performance
Solution Approach 1:
The patent combines the photodetector and readout circuit into a single copackaged module, eliminating the need for external copper traces on PCB. This integration removes the parasitic capacitance and inductance introduced by separate packaging and trace connections, directly resolving the contradiction between ease of manufacture and harmful parasitic effects.
2Device complexity
If multi-channel APD/TIA are connected through copper traces on PCB, then device complexity is reduced, but routing length and electrical property matching become difficult degrading detection performance
Solution Approach 1:
The copackaged design integrates multiple APD/TIA channels within a single module with controlled internal routing. This approach maintains manageable device complexity while ensuring precise routing length and electrical property matching through integrated design, eliminating the routing matching difficulties inherent in separate PCB-based multi-channel configurations.
3Object-affected harmful factors
If photodetector and readout circuit are copackaged in the same package, then parasitic capacitance and inductance are reduced improving signal detection, but device complexity increases
Solution Approach 1:
The patent implements copackaging of photodetector and readout circuit in a single integrated module, which eliminates parasitic capacitance and inductance from external connections. The increased device complexity is managed through systematic integration design, achieving net performance improvement by removing harmful parasitic effects that dominate in separate packaging configurations.
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 design enhances signal detection accuracy and noise reduction, improving the overall performance of the LiDAR system by eliminating routing mismatches and increasing bandwidth.
Implementation Method 1
a photodetector configured to receive the optical signal reflected from the environment of the optical sensing system, and convert the optical signal to an electrical signal
Data Source
AI summary
Embodiments of the disclosure provide an optical sensing system and an optical sensing method thereof. The optical sensing system comprises a light source configured to emit an optical signal into an environment surrounding the optical sensing system. The optical sensing system further comprises a photodetector configured to receive the optical signal reflected from the environment of the optical sensing system, and convert the optical signal to an electrical signal, where the photodetector is disposed in a package. The optical sensing system additionally comprises a readout circuit configured to generate a readout signal based on the electrical signal received from the photodetector, where the readout circuit is disposed in the same package as the photodetector and connected to the photodetector through routings in the package.