MT6620P WIFI 11G中间信道 EVM问题

wang871224

Enter into META Mode OK
        ================WiFi Test Start===================
WIFI Tester is: IQVIEW
6620d

====================== WiFi TX power check begin =====================
========FREQ 2412MHz,DAC 34,Rate:11.0=========
EVM PASS: 9.04(<20.00 %)
Frequency tolerance: 0.68 ppm PASS(+/-10.00)
TX Power (Pass):10.1 min =8.0,max =15.0
===========11B RX=====================11B RX==========
Set SG output level:-76.0!
ch:2412,PER Result: 0.000(rx ok:1000,CRC:0),limit:0.50

========FREQ 2442MHz,DAC 34,Rate:11.0=========
EVM PASS: 7.10(<20.00 %)
Frequency tolerance: 0.90 ppm PASS(+/-10.00)
TX Power (Pass):9.7 min =8.0,max =15.0
===========11B RX=====================11B RX==========
Set SG output level:-76.0!
ch:2442,PER Result: 0.000(rx ok:1000,CRC:0),limit:0.50

========FREQ 2472MHz,DAC 34,Rate:11.0=========
EVM PASS: 8.17(<20.00 %)
Frequency tolerance: 0.77 ppm PASS(+/-10.00)
TX Power (Pass):10.6 min =8.0,max =15.0
===========11B RX=====================11B RX==========
Set SG output level:-76.0!
ch:2472,PER Result: 0.000(rx ok:1000,CRC:0),limit:0.50

========FREQ 2412MHz,DAC 30,Rate:54.0=========
EVM PASS:-31.62dB(<-25.00 dB)
Frequency tolerance: -1.84 ppm PASS(+/-10.00)
TX Power (Pass):8.4 min =5.0,max =12.0
===========11G RX=====================11G RX==========
Set SG output level:-66.0!
ch:2412,PER Result: 0.000(rx ok:1000,CRC:0),limit:0.50

========FREQ 2442MHz,DAC 30,Rate:54.0=========
EVM FAIL:-22.27dB(<-25.00 dB)
Frequency tolerance: 3.05 ppm PASS(+/-10.00)
TX Power (Pass):6.5 min =5.0,max =12.0
===========11G RX=====================11G RX==========
Set SG output level:-66.0!
ch:2442,PER Result: 0.000(rx ok:1000,CRC:0),limit:0.50

========FREQ 2442MHz,DAC 30,Rate:54.0=========
EVM FAIL:-22.10dB(<-25.00 dB)
Frequency tolerance: -0.65 ppm PASS(+/-10.00)
TX Power (Pass):6.6 min =5.0,max =12.0[/COLOR]
===========11G RX=====================11G RX==========
Set SG output level:-66.0!
ch:2442,PER Result: 0.000(rx ok:1000,CRC:0),limit:0.50

========FREQ 2472MHz,DAC 30,Rate:54.0=========
EVM PASS:-33.22dB(<-25.00 dB)
Frequency tolerance: 1.25 ppm PASS(+/-10.00)
TX Power (Pass):8.8 min =5.0,max =12.0
===========11G RX=====================11G RX==========
Set SG output level:-66.0!
ch:2472,PER Result: 0.000(rx ok:1000,CRC:0),limit:0.50

=============FAIL : WiFi Final Test ====================

        WiFi Testing Time:64.19 (sec)

wang871224

哪位大侠看看啊

wanglili

没用过MTK的方案，但从你测量的数据看，54M的速率高中低单个信道的功率将近2dB，如果你芯片本身的性能是OK的话，得调试。athor的芯片有bdata文件可以调，如果发射的功率超过芯片本身的发射极限功率的话，EVM是会恶化的，EVM本身和layout，匹配等有关

selina_zhang

要找专业人士看

zhangqi1110

匹配明显没调好，功率不平坦啊

xiaoguoaiziji

学习了！谢谢各位大大！

jy03254628

谢谢楼主分享

zhguansh

感谢分享