Mirror-Symmetrical Circuit Board Layout for Image Sensor Noise Shielding
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Solution Overview
Problem
Existing solutions for suppressing noise in solid-state imaging devices, such as CMOS image sensors, are inadequate as they either fail to address hot carrier light emission or only partially mitigate inductive noise, leading to image quality deterioration due to residual noise in pixel signals.
Innovation Solution
A circuit board and semiconductor device configuration featuring periodically arranged conductors with specific width relationships and mirror-symmetrical structures, utilizing different voltage power supplies to effectively shield hot carrier light emission and manage inductive noise by adjusting magnetic flux directions, thereby reducing induced electromotive force and noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional single-function wiring is used, then structure is simple, but both hot carrier light emission and inductive noise cannot be suppressed simultaneously
Solution Approach 1:
The conductor layer is designed to perform multiple functions simultaneously: it acts as both a light-shielding structure to block hot carrier light emission and as a magnetic flux cancellation structure to suppress inductive noise. This multi-functional design allows a single wiring structure to address both types of noise, improving noise suppression effectiveness without proportionally increasing device complexity.
2Object-affected harmful factors
If mirror-symmetrical conductor arrangement with different voltage power supplies is used, then both hot carrier light emission and inductive noise are suppressed, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs mirror-symmetrical arrangement of conductors with specific periodic width relationships (rational number relationships between first periodic width and second periodic width) to create balanced magnetic flux cancellation. The asymmetry in voltage values applied to different conductor groups allows for optimized noise suppression while maintaining structural symmetry for manufacturing feasibility.
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
The proposed configuration significantly suppresses both hot carrier light emission and inductive noise, enhancing image quality by minimizing changes in induced electromotive force and noise levels in solid-state imaging devices.
Implementation Method 1
a first power supply connected to the first conductor and the third conductor and a second power supply connected to the second conductor and the fourth conductor are power supplies having different voltage values
Implementation Method 2
a technique of providing a light-shielding structure to wiring formed between the active element and a photoelectric conversion unit
Data Source
AI summary
Provided is a circuit board comprising a first conductor periodically arranged with a first periodic width in a first region, a second conductor periodically arranged with a second periodic width in the first region, a third conductor periodically arranged with a third periodic width in a second region, and a fourth conductor periodically arranged with a fourth periodic width in the second region. The first periodic width and the second periodic width, and the third periodic width and the fourth periodic width are in a rational number relationship, the first periodic width and the fourth periodic width are same or substantially same, the first region and the second region have a conductor structure mirror-symmetrical or substantially mirror-symmetrical in a first direction. A first power supply is connected to the first conductor and the third conductor and a second power supply is connected to the second conductor and the fourth conductor.