手机sensitivity问题

手机受到干扰，插损（s21）也需要调好一点。先调有线的

The most of the problem are definite from mathcing,pls check your receiver path.Else even the highest value you got is too bad(-107dBm),nowadays it usually reach at least -109dBm-110dBm with good PCB artwork.

-109dBm-110dBm 做到是不难 但也不能说-107dBm too bad吧

匹配我换了，可是改变不大，还有什么建议么？

There must be some noise coupled to your RF part, check RF trace firstly, If still have problem then I will give you more suggestions about BB incl.co-processor staff part[/B][/B] Critical Trace[/B] ü The PA output à Antenna will be high power transmit, to minimize the return loss the PA output trace should be strictly Micro stripline; as straight as possible; as short as possibleü The PA input trace is very sensitive and it is better to be separated by Groundü Antenna àLNA input should be minimized the noise and trace route loss. It is better to be Micro stripline and as short as possibleü The loop filter of LOVCO & TXVCO is taken the LDO output as reference level, so it is better to separate these circuits with Ground by LDO output copperü The Transceiver 26MHz ref clock output may affect the LOVCO phase noise, so it is better to separate with loop filters of LOVCOü The I/Q signal trace should be differential (parallel and symmetry) routing, and better to be separated by Groundü The TX_RAMP signal is very sensitive. It should be separated by Ground and better to make the layer bellow the TX_RAMP signal a completed GND area.ü The Audio input & output trace should be separated by Ground and it is better to trace differential.ü ABB will measure the voltage difference of the high accurate Resistor , so the two traces of R2703 à ABB should be same length and same width.ü Components of Microphone input circuit should be put as symmetry as possible.ü SIM test is very sensitive. While PCB layout, the SIM trace, such as V_SIM, SIM_DATA, SIM_RST, SIM_CLK should be kept clean. And reserve a R-C filter location at the side of SIM socket for above lines respectively. [/B]

以下内容含脚本代码[/td]挺全的,但觉得不是都与接收灵敏度有关啊如:The TX_RAMP ,The PA input trace ,The PA output à Antenna 是从哪抄来的吧说明：上面显示的是代码内容。您可以先检查过代码没问题，或修改之后再运行.

你提供的信息太少，你先看看你射频器件下边的那一层有没有问题！

感谢各位大爷啊问题已经解决了更换了saw to tranceiver之间的匹配，大家参考一下顺便问一下，那些值都是试出来的么？有没有什么理论依据，可否告知

好好玩呀前面说换过匹配,不行;现又说换了匹配,好啦偶不能理解的就是:如果是匹配不好,那为何在1800MHz上,两头好(500-700,800-880),中间差(700-800)呀你改完匹配解决后,现在的灵敏度都是多少呀?

开始换匹配不对，所以灵敏度不行修改过后-107

请问你换匹配, 是一点点试, 还是通过计算的呀?
如果是计算 ,请问如何计算的呀?
另外,我还是不明白,"如果是匹配不好,那为何在1800MHz上,两头好(500-700,800-880),中间差(700-800)呀"
请问你能回答吗?

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