Here are some ways to reduce PCB impedance:
- Increase line width: Appropriately increasing the width of the wire can effectively reduce impedance.
- Optimize line spacing: Reasonably adjust the distance between lines.
- Select a PCB material with an appropriate dielectric constant: Choose a PCB material with a lower dielectric constant according to needs.
- Control copper foil thickness: Ensure that the copper foil thickness is within an appropriate range.
- Reduce the length of the transmission line: Try to shorten the length of the transmission line as much as possible in the wiring design.
- Improve the etching process: Make the line width after etching closer to the design value.
- Optimize via design: Reasonably design the size and position of vias to reduce their impact on impedance.
- Ensure the integrity of the reference plane: Avoid discontinuities or damages in the reference plane.
- Select the appropriate solder mask: Consider its impact on impedance and choose the appropriate type.