Multilayer PCB Ground Layout for Oscillator Interference Noise
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Solution Overview
Problem
Existing noise countermeasures in multilayered electronic circuit boards are inadequate when multiple oscillators with similar frequencies are closely mounted, leading to interference noise and reduced effectiveness of noise reduction techniques.
Innovation Solution
The implementation of a multilayer electronic circuit board design with specific non-forming regions in the ground electrode configurations closest to signal terminals, wiring, and pads, which reduces electromagnetic interference by avoiding ground electrode formation in physically close proximity to oscillators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a wide region ground solid is used to reduce high frequency noise, then noise countermeasure effectiveness is improved, but interference noise between closely mounted oscillators increases
Solution Approach 1:
The ground solid is divided into multiple separate ground electrodes, each assigned to a specific oscillator. This segmentation prevents interference noise between oscillators while maintaining effective noise countermeasures for each individual oscillator through its dedicated ground electrode.
Solution Approach 2:
Each oscillator is provided with a dedicated ground electrode with specific local grounding characteristics, allowing optimized noise countermeasures tailored to each oscillator's position and characteristics rather than using a uniform ground solid approach.
2Area of stationary object
If oscillators are mounted at physically close positions to save space, then device compactness is improved, but noise interference between oscillators increases
Solution Approach 1:
By dividing the grounding system into separate ground electrodes for each oscillator, the patent enables close mounting of oscillators without mutual interference, as each oscillator has its own dedicated ground path that prevents noise coupling between adjacent devices.
3Object-affected harmful factors
If ground electrode area is increased to improve noise countermeasures, then electromagnetic shielding is improved, but signal interference through ground electrodes increases
Solution Approach 1:
The grounding system is segmented into separate ground electrodes for different signal paths, preventing signal interference while maintaining comprehensive electromagnetic shielding. Each ground electrode is strategically positioned to shield specific areas without creating interference paths for signals.
Solution Approach 2:
Ground electrodes are positioned as intermediaries between signal lines and external environment, providing electromagnetic shielding while their strategic placement prevents them from becoming interference paths for signals by avoiding direct overlap with signal trajectories.
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 effectively reduces noise interference among oscillators, enhancing noise countermeasures and improving the accuracy of acceleration sensors, inclinometers, inertial navigation devices, and structure monitoring systems.
Implementation Method 1
interference noise exerted by an output signal from the oscillator to other element through the ground electrode
Data Source
AI summary
An electronic circuit board includes a substrate having a multilayer structure including a ground layer, has at least one configuration in which, in a ground layer closest to a signal terminal of an oscillator, a region overlapping a signal terminal in a plan view is a non-forming region of a ground electrode, in a ground layer closest to a first wiring connecting the signal terminal of the oscillator and an input portion of an amplifier, a region overlapping the first wiring in the plan view is a non-forming region of a ground electrode, and in a ground layer closest to a second wiring connecting the signal terminal of the oscillator and an output portion of the amplifier, a region overlapping the second wiring in the plan view is a non-forming region of a ground electrode.