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How to ensure signal integrity and anti-interference capability in the design of EDP and LVDS interfaces?
To ensure the signal integrity and anti-interference capability of EDP (Embedded DisplayPort) and LVDS (Low Voltage Differential Signaling) interfaces during design, the following measures can be taken:
Careful layout techniques: For LVDS interfaces, careful layout techniques are required to avoid impedance discontinuity and signal delay differences, which helps ensure signal integrity.
Wiring and termination: Pay attention to wiring and termination during design to minimize electromagnetic interference (EMI). The LVDS interface has good EMI resistance due to its differential signal transmission characteristics.
Use differential signals: Both LVDS and EDP interfaces use differential signal transmission, which can effectively resist electromagnetic interference and ensure the stability of data transmission.
Avoid common mode noise: Differential signal transmission is less susceptible to common mode noise and generates less electromagnetic interference. The receiver only responds to differential voltage, so noise coupled with adjacent signal traces is considered as common mode modulation by the receiver and is therefore rejected.
Termination scheme: LVDS uses a simple termination scheme, where a single 100 ohm resistor is installed at the receiver input to terminate a differential pair, thereby eliminating reflections.
Signal integrity analysis: In PCB design, it is recommended to ensure sufficient spacing between signal lines, usually at least 3 times the line width, to avoid signal interference. Use appropriate terminal resistors (such as 100 Ω) to match impedance and prevent signal reflection.
Grounding layer design: Use a complete grounding layer between the signal layer and the power layer to reduce electromagnetic interference.
Testing and debugging: Use an oscilloscope to detect signal strength and waveform, determine signal quality, and check if the timing is normal. Capture auxiliary signals and main data line signals using a logic analyzer to analyze timing and data content.
Avoid interference sources: During design, high-speed signal lines should be separated from other signal lines as much as possible to reduce mutual interference. Arrange high-frequency signal lines to be away from low-frequency signal lines.
Use shielding and filtering: Use magnetic rings, tin foil, copper foil, etc. for shielding on transmission lines, or parallel appropriate capacitors on power or signal lines for filtering to reduce interference.
Through the above measures, the signal integrity and anti-interference ability of EDP and LVDS interfaces can be improved, ensuring the stable operation and display effect of the LCD screen.
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