PAD buried blind via solution PADS Layout (PowerPCB) Mobile phone board blind buried via design solution www.kgs.com.hk What is a blind buried via? As the design of portable products is developing towards miniaturization and high density, the design difficulty of PCB is becoming more and more difficult, and higher requirements are put forward for the production process of PCB. In most of the current portable products, BGA packages with a pitch below 0.65mm are all designed with blind buried vias. So what is a blind buried via? Blind vias (Laser Vias): Blind vias are vias that connect the inner layer traces of PCB with the surface traces of PCB. This hole does not penetrate the entire board. Buried vias (Buried vias): Buried vias are vias that only connect the traces between the inner layers, so they cannot be seen from the surface of the PCB. Bisi Electronics Co., Ltd. www.kgs.com.hk What is a blind buried via? The figure is a schematic diagram of the cross-section structure of an 8-layer board: A: Through hole (L1-L8) B: Buried via (L2-L7) C: Blind via (L7-L8) D: Blind via (L1-L3) Note: The following examples are all based on 8-layer boards. Bisi Electronics Co., Ltd. www.kgs.com.hk What are blind and buried vias? The following figure is the cross-sectional structure of blind and buried vias in the Navigator window of PADS Router (BlazeRouter): Layer2-Layer7 buried vias Layer1-Layer2 blind vias Bisi Electronics Co., Ltd. www.kgs.com.hk Blind and buried via settings Set Drill Pairs Click Setup-Drill Pairs... in the menu, and the dialog box shown on the right will appear. Click the Add button on the right to set the layer pairs you need. As shown on the right, three types of blind and buried vias and one type of through-hole are set. Bisi Electronics Co., Ltd. www.kgs.com.hk Blind and buried via settings Set Via type Click Setup-Pad Stacks in the menu, and then select the Via option in Pad Stack Type, and the dialog box shown on the right will appear. Click the lower left...
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