Transmission Line Noise Filter PCB Integration
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Solution Overview
Problem
The increasing clock frequency of microprocessors generates high-frequency noise that existing decoupling capacitors and transmission line type noise filters struggle to effectively manage, particularly due to the impact of wiring patterns on noise filter performance, leading to inefficiencies and increased costs.
Innovation Solution
An electronic circuit design that integrates a transmission line type noise filter with a power supply circuit and printed-circuit board, featuring specific power supply line and ground land patterns to optimize noise removal, allowing for efficient decoupling and reduced noise leakage across a wide frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmission line type noise filter is used to remove high-frequency noise, then noise removal capability is improved, but the frequency characteristics are greatly affected by wiring pattern leading to performance degradation
Solution Approach 1:
The patent merges the noise filter with the printed circuit board by forming the filter electrodes and wiring patterns directly on the PCB substrate. This integration eliminates separate mounting requirements and ensures that the wiring patterns are precisely controlled as part of the board fabrication process, thereby maintaining stable frequency characteristics while achieving effective noise removal.
Solution Approach 2:
The patent incorporates the noise filter design into the preliminary PCB layout stage, where the first and second filter electrodes and their connecting wiring are pre-configured before final assembly. This preliminary action ensures that the wiring patterns are optimized for frequency characteristics from the design phase, preventing performance degradation that would occur with post-assembly wiring variations.
2Object-affected harmful factors
If multiple decoupling capacitors are used to filter noise, then noise removal effectiveness is improved, but the area occupied and mounting cost increase significantly
Solution Approach 1:
The patent combines multiple decoupling capacitor functions into a single integrated noise filter structure formed on the PCB. The first and second filter electrodes with their respective wiring patterns to ground planes create multiple filtering paths within one compact component, achieving the noise removal effectiveness of multiple capacitors while occupying minimal board area.
Solution Approach 2:
The noise filter structure serves multiple functions simultaneously: it acts as a decoupling capacitor, a transmission line filter, and a ground reference structure. This multi-functionality consolidates what would traditionally require multiple separate components into a single element, reducing both area and mounting complexity while maintaining noise removal effectiveness.
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 achieves optimal noise elimination and reduced power loss by aligning the frequency characteristics of the noise filter with its mounting configuration, enabling stable operation and efficient use of space on printed-circuit boards.
Implementation Method 1
a transmission line type noise filter, comprised of a signal input terminal, a signal output terminal and two ground terminals corresponding respectively to the signal input terminal and the signal output terminal, which removes a high-frequency component of direct-current voltage applied to the signal input terminal and outputs it from the signal output terminal
Data Source
AI summary
A power supply circuit produces a supply voltage to be supplied to a microprocessor which is an integrated circuit. A transmission line type noise filter includes a signal input terminal, a signal output terminal and two ground terminals corresponding respectively to the signal input terminal and the signal output terminal. The transmission line type noise filter eliminates a high-frequency component of DC voltage applied to the signal input terminal and outputs it from the signal output terminal. A first power supply line pattern, formed on a printed-circuit board, connects an output terminal of the power supply circuit with the signal input terminal of the transmission line type noise filter. A second power supply line pattern connects the signal output terminal of the transmission line type noise filter with a power supply terminal of the microprocessor. A ground land pattern is connected with an external ground potential through via holes and makes a connection between the two ground terminals.