Semiconductor Power Line Capacitive Coupling for Noise Reduction
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Solution Overview
Problem
Semiconductor devices face noise issues due to resonance current generated between power lines, despite separate power supply lines for output and pre-stage circuits, as inductance components cause potential differences leading to noise generation.
Innovation Solution
Incorporating capacitive elements between power lines for the output and pre-stage circuits to maintain constant potential differences, reducing noise by ensuring the capacitance of these elements is sufficient to manage impedance and resonance frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If separate power lines are provided for output circuit and pre-stage circuit, then noise from pre-stage circuit reaching output circuit is prevented, but resonance current is generated due to inductance components between lines causing potential difference variation and noise
Solution Approach 1:
A capacitive element is introduced as an intermediary component connected between the first power line (supplying output circuit) and the third power line (supplying pre-stage circuit). This capacitor acts as a mediator to suppress resonance current by providing a low-impedance path for high-frequency noise, thereby preventing potential difference variation and noise generation between the separate power lines.
Solution Approach 2:
The patent changes the electrical parameters of the power supply system by adding a capacitive element with specific capacitance value. This modifies the impedance characteristics of the power lines, transforming the resonant circuit behavior and reducing the Q-factor of the resonance, thereby suppressing resonance current and stabilizing potential differences between power lines.
2Object-generated harmful factors
If capacitive elements are added between power lines to reduce resonance current, then noise is reduced, but device complexity increases
Solution Approach 1:
The capacitive element is strategically placed at a specific location where it can most effectively suppress resonance current - between the first and third power lines that are prone to mutual interference. This localized approach targets the specific problem area without requiring comprehensive modification of the entire power distribution system, thereby minimizing added 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
The solution effectively reduces noise between different power supplies by maintaining stable potential differences, as demonstrated by reduced impedance and noise waveform variations, thereby enhancing signal handling in semiconductor devices.
Implementation Method 1
provision of capacitive elements among a plurality of lines for supplying power to circuits prevents variation in the difference in potential between the lines
Data Source
AI summary
A semiconductor device according to this invention includes a first power line that supplies power to a first circuit, a second power line that supplies power to a second circuit, and a capacitive element that is provided between the first power line and the second power line.