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ACMD-7612 Datasheet(PDF) 8 Page - AVAGO TECHNOLOGIES LIMITED |
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ACMD-7612 Datasheet(HTML) 8 Page - AVAGO TECHNOLOGIES LIMITED |
8 / 12 page 8 Figure 20. PCB layout A PCB layout implementing design principles similar to those illustrated in Figure 16 is recommended to optimize performance of the ACMD-7612. It is particularly important to maximize isolation between the Tx connection to the duplexer and the Rx port. High isolation is achieved by (1) maintaining a continuous ground plane around the duplexer mounting area, (2) surrounding the I/O ports with sufficient ground vias to enclose the connections in a “Faraday cage”, and (3) preferably routing the Tx trace in a different metal layer than the Rx. The latter is especially useful, not only to maintain Tx- Rx isolation of the duplexer, but also to prevent leakage of the Tx signal into other components that could result in the creation of intermodulation products and degradation of overall system performance. Figure 21. ACMD-7612 superposed on PCB layout Ant R x Tx 2.27 1.78 G W Ø 0.20 VIA ARRAY HORIZ PITCH = 0.33 VERT PITCH = 0.38 Ø 0.20 VIA ARRAY HORIZ PITCH = 0.38 Notes: 1. Dimensions in mm. 2. Transmission line Gap (G) and Width (W) adjusted for Zo = 50 ohms. 3. I/O Pads (3 ea) 0.53 x 0.53, corner chamfer 0.30. 4. I/O Pad to Ground plane gap = 0.34, corner chamfer 0.30. 5. Ground vias positioned to maximize port-to-port isolation. VERT PITCH = 0.33 Ø 0.20 VIA ARRAY HORIZ PITCH = 0.38 Ø 0.20 VIA ARRAY HORIZ PITCH = 0.33 VERT PITCH = 0.38 0.10 0.10 |
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Similar Description - ACMD-7612 |
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