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标题: 关于蓝牙耳机的Audio Breakthrough Measurement [打印本页]

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作者: yingtao19    时间: 2009-4-15 09:36
标题: 关于蓝牙耳机的Audio Breakthrough Measurement
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$ B, [/ c) l2 C" G$ }3 `1 _. ^# t客户做Audio Breakthrough Measurement的时候Fall。试验结果图附上。
请问：
1：此测试是不是指2.307GHz处产品抗EMI干扰效果不好？
0 x& V# @, l$ s6 L& c! g0 a8 N' Z2：如果1成立，哪么如何解决呢，增加一个过滤此频率段的电容吗还是更改电路、PCB设计？如果增加电容可行，需要多少容值的电容呢？
3：蓝牙耳机那部分需要屏蔽此频率段啊？
7 T$ ~5 C, r" j" j# V0 H8 g: B  G9 F以上，谢谢！

4 @1 o: w; ~& p8 K: ]' m还有哪位大侠能附上Audio Breakthrough Measurement 的一些资料学习一下啊，谢谢

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作者: louislin    时间: 2009-4-25 15:29
虽然测试是参照301 489-7做的，但是实际产品是bluetooth，所以301 489-17的免测带应当适用
0 Y7 i/ c. ?8 l所以2307的频率可以不用测试的。
参见下面的引用
. @7 f/ ?% B$ G5 c8 OThe exclusion band for immunity testing shall be calculated as follows:
8 N: o" k3 |- m$ v  E. ~2 _3 h• lower limit of exclusion band = lowest allocated band edge frequency -5 %;
$ O- J7 `& N, _% X. u7 O( o  O/ C• upper limit of exclusion band = highest allocated band edge frequency +5 %.
$ ]* @1 W6 v: k+ GUsing the 2,450 MHz band as an example:
• lower limit of exclusion band = 2 400 - 120 = 2 280 MHz;
• upper limit of exclusion band = 2 483,5 + 124,175 = 2 607,675 MHz;
2 s, o& H! _3 q, Y2 {. x$ l$ F3 r• thus the exclusion band for 2,45 GHZ equipment falling within the scope of the present document extends
2 f& `/ q1 r* G* ^& D2 M& [from 2 280 MHz to 2 607,675 MHz.

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作者: louislin    时间: 2009-4-25 15:31
即使你看301 489-7，那么免测的频率是6%，更大。所以他们测的有问题！
4.3.1 Receiver and receivers of duplex transceivers exclusion band
9 A- ~( ?! r1 d& r0 @! L& p4 oThe exclusion band for receivers and receiver sections of transceivers is the band of frequencies over which no
immunity tests with radiated RF are made.
1 ]: I* q1 u6 h: KThe lower frequency of the exclusion band is the lower frequency of the receive band of the EUT minus 6 % of that
: r* v0 P) o8 D/ gfrequency.
The upper frequency of the exclusion band is the upper frequency of the receive band of the EUT plus 5 % of that
9 c; f) w% n! H9 z) f- P1 ?frequency.

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作者: 123456gg    时间: 2011-1-2 16:10
希望多一些这方面的资料！！！

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