Remote Reference Power Plane Noise Filtering via Connection Capacitors
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Solution Overview
Problem
Traditional signal integrity design methods lack guidance for remote reference planes, leading to significant noise interference from power supply noise, which can cause false triggering and degrade high-speed signal quality.
Innovation Solution
The method involves identifying noisy power planes on a printed circuit board, determining the placement positions and number of connection capacitors, and placing capacitors with fixed capacitance values to connect the remote reference power plane to ground, thereby filtering out most of the power noise and reducing its influence on signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a remote reference power plane is used in traditional circuit board design, then the circuit board can be simplified and manufactured more easily, but power supply noise interferes with high-speed signals causing false triggering and degrading signal quality
Solution Approach 1:
Connection capacitors are introduced as intermediary components between the remote reference power plane and ground. These capacitors act as noise filters that mediate the interaction between the power plane and high-speed signals, allowing the simplified power plane design to coexist with high signal quality by blocking noise while maintaining the reference function
Solution Approach 2:
The harmful noise component is extracted and separated from the power plane through the connection capacitors. The capacitors create a separate noise filtering path that removes power supply noise from the reference plane, allowing the power plane to maintain its simplified design while the noise is handled separately through the capacitor network to ground
2Reliability
If the distance between signal and remote reference plane is increased to reduce noise influence, then signal quality improves, but the circuit board layout becomes more complex and manufacturing difficulty increases
Solution Approach 1:
Connection capacitors serve as intermediary noise filtering elements that allow the signal to remain close to the remote reference plane without suffering from noise interference. The capacitors create a localized noise filtering zone around the signal path, eliminating the need to increase distance while maintaining signal quality
Solution Approach 2:
The connection capacitors provide localized noise filtering at specific positions along the signal path. Instead of requiring global layout changes or increased distances, the capacitors create localized protective zones that filter noise only where it affects the signal, maintaining compact layout while improving signal quality
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 approach effectively reduces the impact of remote reference power noise on signal quality, improving signal integrity by filtering out noise and stabilizing high-speed signal transmission.
Implementation Method 1
Connection capacitors are added to a position of a power remote reference plane for connecting the power remote reference plane and the ground
Implementation Method 2
Most of a power noise is filtered out, so that the influence on signals is reduced
Data Source
AI summary
A method for reducing influence of a remote reference power noise on signal quality is provided. A remote reference power plane connected to a power module is identified according to a schematic diagram of signal design, and a noised power plane is determined. A position of the noised power plane is found in a PCB, and whether the noised power plane is remote referenced by a high-speed signal is judged. Placement positions and number of connection capacitors are determined according to a layout and routing position of the high-speed signal and a width of the noised power plane. Two capacitors with fixed capacitance values are placed at the placement positions of the connection capacitors. Connection capacitors are added to a position of a noised remote reference power plane of a signal line for connecting the power plane and the ground.