Maintaining continuous impedance in PCB design is important, but if there are occasions when the impedance cannot be continuous, factors such as gradient lines, corners, large pads, vias, and through-hole coaxial connectors can be managed to reduce impedance discontinuities.
Trouble routing 4-layer PCB with (1*2)+(15*16) layers, error when setting vias on bottom layer 16. Can’t put vias down, seeking solution.
The question is about the allowed trough hole and blind vias on a 4-layer PCB design. The idea is to use top and bottom layers for signaling, middle layers for GND and power, and SMT parts on the top layer. However, it seems difficult to find a manufacturer that offers such “freedom”.
Seeking prototyping board house for via-in-pad approach, especially with microvias, and cost estimation.
Creating a spinning circuit on a hard disk drive platter may reduce vibration, but has potential issues due to material conductivity and drilling challenges.
PTH,vias,PCB manufacturing,wellcircuits,electronic engineer
solder mask,PCB manufacturer,reflowing,vias
Manufacturer Requirements for Solder Mask Coverage and Closure of Vias Read More »
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