who knows TDMA noise?

RFfans · 发表于 2005-4-20 23:12:00

i am an RF engineer,my work is to design mobile phone.
i meet the problem of TDMA noise ,who knows how to analysis this problem,
or how to measure it , or anything about it.

程序员MM · 发表于 2005-4-20 23:27:00

TDMA noise,is it 216.7Hz?en~~ maybe always mentioned in audio loop.
when a mobilephone is worked ,transmitter and PA enabled once every eight time interval,it's period is about 216.7Hz.so it can be interfere with the audio loop.
We can solve it with good layout in audio loop and in circuits we always shunt a capacitor of 39pf or 47pf iin the route of audio to decrease the noise.

feel · 发表于 2005-4-21 14:24:00

Hi all,I have encountered similar problem,below is suggest to u
1.Match antenna to minimize RF signal leakage to ground.
2.Separate Audio part ground from RF ground planes.
3.Vcc decoupling low pass filter for microphone bias generator.

feel · 发表于 2005-4-21 14:27:00

More good solutions you can study this document
[br]+3 RD币

RFfans · 发表于 2005-5-12 17:51:00

不错，楼上上传的文章不错

Nivea · 发表于 2005-5-31 08:11:00

也要注意Audio部分电路接地，有时ground会串上来干扰

computer · 发表于 2005-6-7 18:53:00

长见识，顶一下

syang · 发表于 2005-6-23 17:58:00

好文章，顶

roger168 · 发表于 2005-6-30 11:47:00

good document

gardener · 发表于 2005-6-30 23:02:00

我怎么打不开？？[em03]

dff · 发表于 2005-7-4 08:32:00

可以在音频电路上通过增加地线，变单路为差分的办法来部分解决。

莱恩 · 发表于 2005-7-29 10:38:00

thanks

hy · 发表于 2005-7-29 11:20:00

可惜看不见

paulli · 发表于 2005-8-2 09:46:00

文章内容不错

vivizf · 发表于 2005-9-8 20:21:00

burst noise一般控制在多少算合适呢？

zhu6364 · 发表于 2005-9-12 13:21:00

用什么方法可以确认是TDMA噪音呢？

kkwd · 发表于 2005-9-13 13:18:00

用示波器看噪音频率，是否为216.7HZ[br]+3 RD币

leuven · 发表于 2005-9-13 14:23:00

gdzhou · 发表于 2005-9-13 19:17:00

我们这都是用专门的音频测试仪器测试busrt noise是否达标。如果能用示波器看出来，那个干扰已经很大了。[br]+3 RD币

yellowtoot · 发表于 2005-9-13 20:53:00

<DIV class=quote>以下是引用dff在2005-7-4 8:32:20的发言：
可以在音频电路上通过增加地线，变单路为差分的办法来部分解决。</DIV>

能否给个电路呀? 谢谢啦!!
是不是在MIC端直接加个地线,然后当做差分走线,在到芯片时,再将其与主地相连啊?[br]+3 RD币

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好文章，好风格，值得发扬