Universal Global Scientific Industrial Co. Ltd. VZ22Q Manuale Utente

                                                                  VZ22Q  LTE  Module 

V0.1 
 

USI 

Confidential

 

Page 19 of 23 

i. 

To avoid a cross-talk issue result from having no enough space between channels or 
input/output traces. The cross-talk may interfere in analog signal, especially the 

MIC1P/MIC1N and MIC2P/MIC2N. In Figure 5-4, the isolation between 

LINE_IN_R/LINE_IN_L, and MIC1P/MIC1N are routing as wider as possible (L at least 
60 mils).   

 

 

            

  Figure 5-4. The routing for Analog Inputs (L>60 mils, D≦10 mils) 

 

ii. 

The MIC1P/MIC1N and MIC2P/MIC2N input signals are more sensitive than the other 
signals. These two signals may route to the other layer if possible, and we can see that in 
Figure 5-5 .In Figure 5-5, LINE_IN_R/LINE_IN_L those input signals is routing on Layer-1. 
But MIC1P/MIC1N and MIC2P/MIC2N input are routing on different Layer (Ex. Layer-2) 
between codec and phone jack input. 

 

Figure 5-5. The special routing for MIC input signal (D≦10 mils) 

 

iii. 

For better performance, analog input & output traces width should be as wide as possible. 
 MIC1P/MIC1N, MIC2P/MIC2N >10 mils (15mils is better.)