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Name A Second-Order HDI Cell Phone Board
Interview
| 【TYPE】： | Typical high-end consumer electronic product board |
| 【Difficulty】： | Ⅰ.Very small, its main board is half the size of a common cell phone board. Ⅱ.Strange shape results in great limits for routing; Ⅲ.GSM & WCDMA dual-mode cell phone results in a large radio-frequency area. Ⅳ.Super-thin cell phone solution limits the board thickness; placing the whole radio-frequency module under the baseband chip results in great limits in hole drilling on the baseband chip; Ⅴ.Originally, ALIVH materials was to be used, but considering cost and risk reduction, we used second-order buried via scheme, but the routing requirements were not degrade. |
| 【Countermeasure】： | Ⅰ.By discussing with multiple PCB manufacture partners, we set appropriate design parameters; Ⅱ.With RF experts' participation in PCB design, strict design process assured signal quality of the board; Ⅲ.Careful optimization achieved the best coordination among requirements of different parties; |
| 【Result】： | Design fulfilled according to the plan, successful CAM and smooth debugging. |
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