Autonomous Vehicle Camera PCB Floor Plan Signal Integrity
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Solution Overview
Problem
Autonomous driving vehicles require high-speed data signal paths to handle high-definition camera signals, but existing technologies face challenges in optimizing signal paths to improve signal quality due to issues like impedance discontinuity and signal reflections.
Innovation Solution
A method for routing a conductive path within a printed circuit board (PCB) is developed, which includes routing segments using signal vias and transmission lines across multiple signal layers, optimizing the signal path to minimize impedance discontinuity and signal losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed data signal paths are used for high-definition cameras, then bandwidth utilization is improved, but signal quality deteriorates due to impedance discontinuity and signal reflections
Solution Approach 1:
The conductive path is divided into multiple segments: a first segment from the connector interface to the image sensor using signal vias, a second segment from the image sensor to the receiver circuit using transmission lines, and a third segment from the receiver circuit to the processor using additional signal vias. This segmentation allows each segment to be optimized for its specific function, maintaining signal integrity while supporting high bandwidth requirements.
Solution Approach 2:
Transmission lines are introduced as intermediary components between the image sensor and receiver circuit, and between the connector interface and image sensor. These transmission lines act as mediators that properly impedance-match the high-speed signals, reducing reflections and maintaining signal quality while enabling high bandwidth data transmission.
2Adaptability or versatility
If signal vias are used to route conductive paths across layers, then connectivity is improved, but impedance discontinuity increases causing signal reflections
Solution Approach 1:
Signal vias are used as intermediary connectors between different PCB layers, allowing the conductive path to transition from the connector interface to the image sensor and from the image sensor to the receiver circuit. The vias are designed and positioned to minimize impedance discontinuity, maintaining signal integrity while providing necessary layer-to-layer connectivity.
Solution Approach 2:
The signal vias are strategically positioned and designed with specific characteristics (such as via diameter, plating thickness, and surrounding ground structures) to maintain consistent impedance at critical transition points. This local optimization ensures that the via connections do not create significant impedance discontinuities that would cause signal reflections.
3Reliability
If transmission lines are optimized for signal routing, then signal quality is improved, but device complexity increases
Solution Approach 1:
The transmission line routing is segmented into distinct sections: a first transmission line from the connector interface to the image sensor, and a second transmission line from the image sensor to the receiver circuit. Each transmission line segment is optimized for its specific routing requirements, allowing for controlled impedance and reduced signal degradation without creating an overly complex overall design.
Data Source
AI summary
A printed circuit board (PCB) includes one or more signal layers in between a first surface and a second surface, the one or more signal layers including a first signal layer. The PCB includes a connector interface disposed on the first surface and a first signal via electrically coupled to the connector interface. The PCB includes first transmission line disposed at the first signal layer electrically coupling a first location to a second location of the first signal layer and a second signal via disposed at the second location. The PCB includes a power-over-cable circuit disposed on the first surface and electrically coupled to the second signal via and a receiver circuit disposed on the first surface adjacent to the power-over-cable circuit. The PCB includes a second transmission line disposed on the first surface layer electrically coupling the power-over-cable circuit to the receiver circuit.