Imaging Sensor Power Layout for Magnetic Noise Suppression
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Solution Overview
Problem
Imaging apparatuses face noise contamination from external magnetic fields due to the capture of magnetic fields by loops formed by power source and reference voltage supplying wires, which affects signal processing and image quality.
Innovation Solution
The design includes separate signal processing units and voltage supply terminals arranged in different directions to minimize the area of the loops capturing external magnetic fields, using decoupling capacitors and specific voltage supply paths to reduce noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power source and reference voltage supplying wires form loops to supply voltages to pixel units and signal processing circuits, then the imaging apparatus can function properly with adequate voltage supply, but external magnetic fields are captured by these loops and observed as noise
Solution Approach 1:
The patent divides the voltage supply system into multiple independent paths. Specifically, it separates the supply of first voltage (e.g., power source voltage) and second voltage (e.g., reference voltage) through different external connecting terminals and different wire groups. This segmentation prevents the formation of large loops that would capture magnetic fields, while still ensuring reliable voltage supply to all necessary components.
Solution Approach 2:
The patent applies different supply configurations to different regions of the imaging apparatus. Different pixel units and signal processing circuits receive voltages from different external connecting terminals arranged in different directions relative to the pixel region. This local differentiation minimizes loop areas in each region, reducing magnetic field capture while maintaining proper local voltage supply.
2Object-affected harmful factors
If multiple external connecting terminals are arranged in different directions to supply voltages to different signal processing units and pixel groups, then loop areas are minimized reducing magnetic field noise, but the device complexity increases
Solution Approach 1:
The patent makes each external connecting terminal serve multiple functions. Each terminal not only supplies voltage but also serves as a reference point for directional arrangement. The terminals are arranged in different directions relative to the pixel region, and each terminal's voltage supply path is designed to minimize loop area while supporting multiple signal processing units and pixel groups. This multi-functionality reduces the need for additional dedicated terminals, thereby controlling device complexity.
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 configuration effectively reduces noise originating from external magnetic fields, improving image quality and signal processing accuracy, especially in imaging apparatuses with densely packed pixels and multiple signal processing circuits.
Implementation Method 1
a pixel region including a first group of pixels configured to perform a photoelectric conversion and a second group of pixels configured to perform the photoelectric conversion
Data Source
AI summary
An imaging apparatus includes: a first signal processing circuit arranged in a first direction to process a signal from a first group of pixels; a second signal processing circuit arranged in a second direction to process a signal from a second group of pixels; a first external connecting terminal arranged in the first direction to supply a first potential to the first signal processing circuit; a second external connecting terminal arranged in the second direction to supply the first potential to the second signal processing circuit; a third external connecting terminal arranged in the first direction to supply a second potential to the first group of pixels; and a fourth external connecting terminal arranged in the second direction to supply the second potential to the second group of pixels.