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Resonance Analysis for Efficient Product Development~共振解析 製品開発の効率化~BLOG

Resonance Analysis for Efficient Product Development~共振解析 製品開発の効率化~

1. Resonance Analysis for Efficient Product Development

Towa Circuit Resonance Analysis for Efficient Product Development Providing Safer and More Reliable PCB Designs

Hello everyone.
Are you utilizing resonance analysis? Reliable PCB design is achieved through the power of resonance analysis.
After PCB design approval, resonance analysis is performed.
Based on the results, problematic areas are identified and improvements are reflected in the PCB design.
Resonance analysis is a crucial step to ensure stability and reliability. By conducting proper resonance analysis, we can improve signal quality and performance while identifying issues in advance.
At Towa Circuit, we accept requests anytime upon customer demand.
※ This is an optional service and requires an additional fee. Please feel free to contact us.

Towa Circuit Introduction to Resonance Analysis Cases

◉ Resonance Analysis After PCB Design

The system used for resonance analysis is DEMITASNX(R) Ver5.1-001.

Resonance Analysis NG

Resonance Analysis NG Diagram
Resonance Analysis NG Graph

Since resonance components were observed in the power plane relative to the excitation power source, the result was judged as Resonance NG (Not Good).

Resonance Analysis OK

Resonance Analysis OK Diagram
Resonance Analysis OK Graph

Since no resonance components were observed in the power plane relative to the excitation power source, the result was judged as Resonance OK.

 

◉ Implementing Countermeasures for Resonance NG Areas

Resonance Analysis OK

Resonance Analysis Detailed Layout Confirmation
Resonance Analysis Detailed Layout Confirmation

After adding four capacitors in the simulation, the resonance components in the power plane fell below the allowable voltage limit, resulting in a Resonance OK judgment.

 

—— About DEMITASNX Resonance Analysis ——

 

【Analysis Result Judgment Criteria】

  • 1. No resonance within the analysis frequency range
  • 2. Allowable maximum voltage level
  • 3. No resonance within the target frequency range: If no plane resonance is detected, it is considered OK regardless of voltage level.
  • 4. Allowable maximum voltage: If plane resonance exists, the allowable maximum voltage is applied. If the resonance exceeds the allowable voltage, it is NG; if it remains below the allowable voltage, it is OK.

The frequency characteristics graph of plane resonance analysis visualizes the maximum voltage of the target plane at each frequency.

【Plane Resonance and Resonance Analysis with DEMITASNX】

Noise (electromagnetic waves) propagating between the power-ground planes of a printed circuit board undergoes multiple reflections at the plane edges. When the distance between the plane edges corresponds to half the wavelength (or its multiples) at a specific frequency, standing waves form.
This phenomenon is called **plane resonance**, and the specific frequencies where these occur are referred to as **resonance (peak) frequencies**.
The power-ground plane is modeled as an **RLCG equivalent circuit**, and circuit analysis is performed using **SPICE simulations**.
The analysis results are displayed as voltage distribution maps and frequency characteristic graphs.

Resonance Analysis - Detailed Layout Verification
Resonance Analysis - Detailed Layout Verification

Relationship Between Allowable Maximum Voltage and No Resonance

When plane resonance is present, the characteristic graph appears as the red line in Figure 2, showing voltage peaks at specific frequencies. On the other hand, when there is no plane resonance, the characteristic graph follows the blue line, indicating an increase in impedance as the frequency increases.

Resonance Analysis - Figure 2
Analyzing the radiated electric field under the same resonance analysis conditions produces the result shown in Figure 3, where the red line indicates a higher radiated electric field.

Resonance Analysis - Figure 3

What is Radiated Electric Field?

The far-field radiated electric field is analyzed using the 3-meter method.
The electric field strength (dBuV/m) radiated from the PCB’s power and ground planes at a distance of 3 meters is calculated.

Resonance Analysis - Figure 4

By performing resonance analysis and countermeasures after PCB design,
we provide safer and more reliable PCB operation.

Resonance Analysis - Towa Circuit Provides Safe and Reliable PCBs

We aim to be a trusted partner through sincere work.

For PCB Design, Choose Towa Circuit

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