SR2351

sanders

SR2351A的应用中有几个疑问，请路过了解的帮忙解疑，谢谢！

1、SR2351A中WIFI和BT是共一个LNA的，SR2351的特性中有一项是支持WIFI和BT同时接收，问题是同时接收时不会互相干扰吗？实际中有这种需求和应用吗？
2、BT是跳频的，这个跳频的实现是SR2351A根据跳频序列自己更新内部的BT Synth频率还是基带芯片来控制？
3、SR2351A的IQ及相关控制信号线需要做包地处理，真的需要这样吗？这样对PCB布局就会有比较高的要求。

cjyang

正常來講,IQ訊號都需要包地,以防被干擾或是干擾別人,
他需要比較好的隔絕,畢竟這是組需要相當精準的訊號

因为是差分信号，需要参考地平面

chonger

展讯BT,WIFI共存问题是一直存在的问题，不管是7731的2351C还是9830的2341B，所以，存在干扰在展讯平台属正常。
IQ RF信号包地是基本的，个别还需要上下左右包地。

whitesox

Thanks for share

ziji

学习了！！！！

loic_cxz

chonger 发表于 2015-5-9 10:12
展讯BT,WIFI共存问题是一直存在的问题，不管是7731的2351C还是9830的2341B，所以，存在干扰在展讯平台属正 ...

还需要上下左右包地。这个是怎么包地呢

qianliduxing1

1 虽然控制管教上看上去是同时接受，但是这个是芯片端去做时分控制的，所以并不冲突；现在外面的芯片应该都是通过算法去解决二者共存问题，通路应该都是一致的；
2 基带芯片控制的，2351A只是简单地一个tranceiver；
3 尽量包地处理，最好是立体包地，上下左右；

sanders

qianliduxing1 发表于 2015-8-22 12:49
1 虽然控制管教上看上去是同时接受，但是这个是芯片端去做时分控制的，所以并不冲突；现在外面的芯片应该都 ...

针对第2个问题，我的理解：基带根据跳频序列并通过它和2351之间的SPI接口来更新2351内部的BT Synth频率，从而实现跳频。1600跳/秒，625us/跳，这么短的时间里2351内部的BT Synth频率来得及更新吗？

HAISAN2012

长期专业大量求购村田 EPCOS 三星 华新科 滤波器 双工器 13927462033罗生 邮箱：13927462033@163.com 深圳市意铭科技有限公司

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长期专业大量求购村田 EPCOS 三星 华新科 滤波器 双工器 13927462033罗生 邮箱：13927462033@163.com 深圳市意铭科技有限公司

qianliduxing1

sanders 发表于 2015-8-24 10:11
针对第2个问题，我的理解：基带根据跳频序列并通过它和2351之间的SPI接口来更新2351内部的BT Synth频率， ...

我们工作时是26MHz时钟在工作，可以满足要求的

学习了，感谢