| 主题：ST 新推出的简装版电力线载波芯片-ST7540 |
| 在线问答： |
| [问：zongxl] |
目前电力线载波通讯最大速率?遇到变压器如何处理? |
| [答：Jane] |
4800bps,不能跨变压器通信 |
[2006-8-23 10:33:02] |
| [问：guoshaoguang] |
ST7540 本身驱动的最大通讯距离 |
| [答：Jane] |
理想的是1km |
[2006-8-23 10:33:21] |
| [问：tzw750303] |
有demo板或电路图吗？ |
| [答：Jane] |
Please download from www.st.com/powerline |
[2006-8-23 10:34:01] |
| [问：kangqiao203] |
请详细介绍电力线网络系统的方案设计基本步骤和ST所提供的设计资源.
谢谢! |
| [答：Jane] |
ST仅提供芯片，但我们可以给客户的设计提供建议 |
[2006-8-23 10:36:19] |
| [主持人：ChinaECNet] |
我们已经进入问答阶段如果听众想重温演讲或内容可以点击下面“回顾演示”重看演讲。 |
[2006-8-23 10:36:56] |
| [问：yaolei_sh] |
请问贵公司推出这款电力载波芯片有没有配套推出相关的开发套件，以及提供
可供给客户演示的功能模块？ |
| [答：Pruby] |
ST有相应的DEMO板可以提供给客户，进行演示。 |
[2006-8-23 10:39:15] |
| [主持人：ChinaECNet] |
在此回答问题的专家是ST公司的：Jane Yuan、Pruby He、Alessandro Lasciandare和Emile
Saccani。 |
[2006-8-23 10:40:10] |
| [问：kittin] |
请介绍一下7538/7540的工作频率，和载波数量，每个载波的带宽？还有其工作的TCP/IP速率是多少？谢谢 |
| [答：Jane] |
波特率从600 to 4800,共有8各载波频率段。根据频偏的不同可以设置带宽 |
[2006-8-23 10:40:19] |
| [问：tony_lht] |
最大通讯距离是指点对点吗？中间有分支怎么办 |
| [答：Jane] |
通信距离应根据实际情况来定，我们只能说理想的是1km,point ot point/ |
[2006-8-23 10:41:07] |
| [问：penghaonan] |
请介绍ST7540的编码原理 |
| [答：Jane] |
FSK |
[2006-8-23 10:42:07] |
| [问：rzy] |
是否有典型应用范例，特别是家用三表抄表领域的？ |
| [答：Jane] |
在电表的自动抄表领域应用很广 |
[2006-8-23 10:43:32] |
| [问：rabbit19820] |
电力线载波的信号怎样传到上位机进行通信呢？ |
| [答：Jane] |
通过mcu和上位机通信，目前st7540提供了uart接口，也可直接连接rs232 |
[2006-8-23 10:44:56] |
| [问：larryyee] |
Did ST make any field test in PRC region for
AMR application? If yes, What"s the failure rate? |
| [答：Jane] |
For ST7538 we have many examples.It is successful on the filed test. |
[2006-8-23 10:46:07] |
| [问：fzs] |
目前有没有跨变压器的桥接方案？ |
| [答：Jane] |
No |
[2006-8-23 10:46:14] |
| [问：rzy] |
如何组建网络？网络的通信协议是怎样的？不同用户之间是否存在通信冲突？如何处理？ |
| [答：Jane] |
可通过中继方式，通信协议需要用户自己来定，ST7540 仅由物理层的功能 |
[2006-8-23 10:47:53] |
| [问：kittin] |
请问过零检测是什么意思，原理和作用是什么？谢谢 |
| [答：Jane] |
请参阅AN1417 application notes 38page.Download from www.st.powerline. |
[2006-8-23 10:51:04] |
| [问：zuoyou] |
ST7540载波频率可动态调整吗 |
| [答：Jane] |
如果设定好了就不可调，没有跳频功能 |
[2006-8-23 10:52:07] |
| [问：ssxh0408] |
如果不在电力线上传输,理想的传输距离是不是更远一些? |
| [答：Jane] |
会 |
[2006-8-23 10:52:23] |
| [问：linshuch] |
If st7540 discover the whole area,can ST7540
form repeater automatically |
| [答：Jane] |
不能。需要mcu配合来实现 |
[2006-8-23 10:53:27] |
| [问：linshuch] |
该芯片有链路层功能吗? |
| [答：Jane] |
没有，通过mcu来实现 |
[2006-8-23 10:53:46] |
| [问：kittin] |
7538和7540符合什么组织或国际标准？ |
| [答：Jane] |
EN50065 |
[2006-8-23 10:54:06] |
| [问：larryyee] |
Do you think the performance will be affected
if the Power Line is very noisy? |
| [答：Jane] |
Yes,If the noise is very serious.The communication will be affected. |
[2006-8-23 10:55:20] |
| [问：eric_chf] |
What is the maximum number of usable transceivers
in a typical power line application with ST7540? |
| [答：Jane] |
256 |
[2006-8-23 10:55:46] |
| [问：ideaxuwen] |
st7540可否兼容st7537? |
| [答：Jane] |
支持st7537的某些特点 |
[2006-8-23 10:56:34] |
| [问：tony_lht] |
请问ST7540使用的是什么接入方式？csma什么的？ |
| [答：Jane] |
SPI/UART interface with MCU.FSK modulate mode |
[2006-8-23 10:57:49] |
| [问：liuxsh] |
我是st7538国内最早的用户，在一定程度上也是应用比较成功的用户。对st推出的新品很感兴趣。想问：在大陆谁做销售代理？零售价？批量价？是否可以送几粒样片？谢谢。哈工大
刘晓胜 |
| [答：Pruby] |
您可以登陆http://www.st.com/stonline/address/distrib/add_asia.htm#chi_hon
查看并选择我们的代理商。具体的价格请询问当地的代理商。ＳＴ及其指定代理商都可以提供样片。 |
[2006-8-23 10:58:47] |
| [问：jwsun] |
1、使用本芯片，信息传送的速度及可靠性品质如何？是否经过严格的试验验证？
2、该芯片为基础的通讯系统面对电网的复杂现实，其适应性如何？ |
| [答：Jane] |
1:Yes.
2:我想这些不是一个芯片所能决定的，需要很好的系统设计及路由算法 |
[2006-8-23 10:59:32] |
| [问：lhlcxh1120] |
请问，这款新片的通信方式是半双工，还是单工？
用在中国电力环境中是否合适？ |
| [答：Jane] |
半双工的方式，只要设计合理用在哪里都合适的 |
[2006-8-23 11:00:21] |
| [问：yaolei_sh] |
贵公司推出这款电力载波芯片对信号的传输精度如何？出错率如何？会不会随着传输距离的拉长信号精度越来越低，如果是这样的情况 ，请问有没有相关的配套解决方案？ |
| [答：Jane] |
ST7540 can load max 500mA curren.The successful rate is defined by enviroment.
If the distance is far.the communication effect is bad. |
[2006-8-23 11:04:33] |
| [问：kittin] |
请问主从模式怎么设置，基于什么原理？ |
| [答：Jane] |
ST7540/38同mcu有两种方式通信同步极异步，如果同步方式需要MCU采样ST7540/38的CLR-T脚的时钟来通信。异步则不用管时钟 |
[2006-8-23 11:07:50] |
| [问：larryyee] |
What factors will affect the communication
between PLCs? |
| [答：Jane] |
负载的情况会对同心有很大的影响 |
[2006-8-23 11:08:45] |
| [问：zera_lu] |
"ST7540采用BCD5混合信号技术的功率处理功能，利用了原有的ST7538内核，将一个新的单端功率放大器嵌入在这个集成的模拟前端内."--------请问:这样的嵌入是否会因芯片工作温度过高而造成通讯不稳定,甚至断网的现象?是否需要加散热片的考量?(Intellon
INT5200就是典型失败的例子) |
| [答：Jane] |
不会的，温度过高就芯片会自动保护，降温以后还可以继续通信。在芯片底部有散热片不需额外加了 |
[2006-8-23 11:10:41] |
| [问：mikenee] |
请问该芯片的价格如何?在何处购买?另外供货周期多长? |
| [答：Pruby] |
具体价格请咨询ST指定的代理商，您可以访问http://www.stmicroelectronics.com.cn/stonline/address/distrib/index.htm
来选择ST的代理商。 ST7538的Leadtime 为１２周。 |
[2006-8-23 11:11:04] |
| [问：kangjinmin] |
电力线载波芯片-ST7540 的通信距离最远是多少,如何达到30KM?
康工
kang@mail.zlnet.com.cn |
| [答：Jane] |
我想您这个要求需要加几级中继才可实现了 |
[2006-8-23 11:11:32] |
| [问：xfbd] |
比起ATMEL的产品有什么优势 |
| [答：Jane] |
ST7540/38仅是载波芯片，不知您指的ATMEL哪款产品 |
[2006-8-23 11:12:34] |
| [问：njwanglei2003] |
请问此芯片能不能和高频信号混合使用同一射频电缆传输,如果可以信号混合和分离如何使用. |
| [答：Jane] |
st7538/40的最大载波频率为132K，如果是高频应该没问题，只要在输入部分加带通滤波器就可 |
[2006-8-23 11:14:05] |
| [问：bency] |
目前该芯片主要应用在哪些领域，效果如何？谢谢 |
| [答：Jane] |
自动抄表，路灯控制，楼宇自动化都可以， |
[2006-8-23 11:15:48] |
| [问：lijin_as] |
如果协议自己订，7540的包头检测是怎么回事？ |
| [答：Jane] |
这是硬件内部自动监测的部分，你可以自定义16/8位的数据作为报头，以实现同步 |
[2006-8-23 11:17:46] |
| [问：mikenee] |
我们想用在路灯管理上，请问电子整流器的干扰对其通讯距离有多大的影响? |
| [答：Jane] |
我想最好将它们分开，不要再一个模块中 |
[2006-8-23 11:18:34] |
| [问：kittin] |
1Km电力线的衰减怎么算，最大衰减是多少？ |
| [答：Jane] |
这需要根据电缆的特性来算的， |
[2006-8-23 11:19:46] |
| [问：larryyee] |
What can we do in PCB or software design in
order to prevent the noise from PowerLine? |
| [答：Jane] |
Please reference the seminar. |
[2006-8-23 11:21:46] |
| [问：rzy] |
中继需要另外的芯片吗？ |
| [答：Jane] |
It can be implement through MCU |
[2006-8-23 11:22:08] |
| [问：yaolei_sh] |
请问贵公司推出这款电力载波芯片在中国国内电网运行的稳定性如何，因为国内电网与国外电网的还是有很大差异的 |
| [答：Jane] |
确实如此，这要看个公司的设计能力了，因为这仅是个载波芯片，他不能决定所有的事情 |
[2006-8-23 11:23:34] |
| [问：oneleg64] |
1、通讯距离问题？2、中继的实现方法？3、自动寻址问题？4、负载变化对通讯的影响及相应解决方法？5、10KM距离间的通讯实现方法？ |
| [答：Jane] |
1，理想的是1km
2,3:由MCU配合来实现，
4：ST7540/38内部有自动增益控制，可缓解负载变化对通信的影响。
5：要通过几级中继来实现 |
[2006-8-23 11:27:47] |
| [问：anwyo5421] |
请问: 3,在不同的配电变压器供电线路中传输信号会有什么问题? 4,供电线路中的负载及其瞬变对传输信号会有什么影响? |
| [答：Jane] |
3，ST7540/38仅可在同一变压器下工作，不能跨变压器。
4，可能会通不上信，可换个时间在通 |
[2006-8-23 11:34:05] |
| [问：echokou] |
ST7540适用于工业控制吗 |
| [答：Jane] |
可以。 |
[2006-8-23 11:34:16] |
| [问：kittin] |
TCP/ip速率最大只有4800bps，是否太小，作何应用？ |
| [答：Jane] |
波特率最大是4800。这个不是宽频芯片，仅是窄带芯片，不能实现上网的。 |
[2006-8-23 11:36:43] |
| [问：RENJIANMIN] |
载波频率有几种? |
| [答：Jane] |
8种从60k to 132k. |
[2006-8-23 11:37:22] |
| [问：kittin] |
芯片能支持的最大衰减是多少？ |
| [答：Jane] |
接收灵敏度是500uV |
[2006-8-23 11:39:14] |
| [问：rzy] |
该芯片工作时对电网本身会不会带入其他的杂波？ |
| [答：Jane] |
载波频率应该不算是干扰吧 |
[2006-8-23 11:40:29] |
| [问：apitx] |
有应用举例吗？最好是元器件各种参数标示清楚，这样便于参考设计，我的Email:apitx@zj.com |
| [答：Pruby] |
ST可以提供相应的application note帮助用户进行参考设计。您可以访问http://www.st.com/sitesearch/consult5/index.php
?mid=29e7ebcb9fde302ae47c8901d3f0a269&l
=en&q=ST7538 获得详细信息。 |
[2006-8-23 11:42:28] |
| [问：ywzhou] |
1.ST7540的通信距离能达到多少米?
2.在不同相线之间能够进行通信吗?如果能,通信距离会有多大程度的减小?
3.通讯的可靠度能达到多少?
4.请提供使用的方法和注意事项.
5.价格?购买途径? |
| [答：Jane] |
1：理想的是1km
2:不能
3：接受灵敏度是500uV,
4:please reference the seminar.
5:please contact to 0755-86012385 |
[2006-8-23 11:42:31] |
| [问：eric_chf] |
請問連接數量有限制嗎? |
| [答：Jane] |
Yes.最多可连256 |
[2006-8-23 11:44:27] |
| [问：sunward] |
ST的动力线通信芯片采用什么样的编码或调制方式?OFDM在动力线通信有什么特别的优点? |
| [答：Jane] |
ST7540/38 is FSK modulate mode. |
[2006-8-23 11:45:22] |
| [问：wuanhe] |
您好: 我在电表自动抄收系统中用到电力线载波,我比较过一些同类芯片的性能,多数都不太行,很想知道ST7540的性能及价格?还希望其文档资料和DEMO板及供货商能早点公布出来.
|
| [答：Pruby] |
您可以通过访问http://www.st.com/sitesearch/consult5/index.php?
mid=29e7ebcb9fde302ae47c8901d3f0a269&l=en&q=ST7540 获得关于ST7540的demo及其他信息。
你可以通过访问http://www.stmicroelectronics.com.cn/stonline
/address/distrib/index.htm 选择ST制定的代理商 |
[2006-8-23 11:45:37] |
| [问：yuangq] |
动力线通信中的变压器有什么特别的要求?它和一般的高频变压器有什么不同?有参考设计吗? |
| [答：Jane] |
please reference the seminar. |
[2006-8-23 11:45:43] |
| [问：anwyo5421] |
目的:了解器件,熟悉性能,实际应用,大力推广.
建议:提供资料,介绍实例,赠送样品,方便订购.
问题; 1,请介绍检测 ST7540 的简单方法. 2,ST7540
对输入信号有些什么要求?传输信号的距离有何限制? 能实现多少路远控? |
| [答：Jane] |
谢谢您的建议。
1：Please reference the datasheet or this seminar.
2:The received level is 500uV.The distance is determined by the enviroment. |
[2006-8-23 11:52:31] |
| [问：yuangq] |
电力线的杂波频率很广,而且还与用户使用负载的时间不同而不同。请问，电力线通信如何能过滤干扰？ |
| [答：Jane] |
我想通信效果要有多方面决定的，仅从载波芯片来说也只是在硬件接受部分加些滤波器而以 |
[2006-8-23 11:55:09] |
| [问：rzy] |
因为对于交流供电的弱电系统来说，有50周的工频干扰，我想载波也容易造成工频干扰，这样对其他系统来说，需要考虑这些频率的滤除了应该 |
| [答：Jane] |
应在接受部分加带通滤波器 |
[2006-8-23 11:56:50] |
| [问：hbang] |
用于楼宇中电力线路中电子整流器很多，如何保证可靠传输？ |
| [答：Jane] |
最好将载波部分远离，并密封 |
[2006-8-23 11:59:15] |
| [问：yuangq] |
动力线载波通信的带宽目前能达到多款?可以像电话线那样接入到互联网吗? |
| [答：Jane] |
F ("0") = FCarrier + [ΔF]/2
F ("1") = FCarrier - [ΔF]/2
ΔF is the Frequency Deviation.
可按照上述公式计算带宽，不能连到电话线上 |
[2006-8-23 12:01:28] |
| 非在线问答： |
| [问：] |
1、在电力载波集抄系统上,单单依靠点对点通讯能力已经证明很难成功的情况下,为什么ST还要推出这样一款芯片?是出于什么样的考虑?
2、ST一向对大客户很慷慨，而小客户连样片都很难申请，更别说开发工具。希望ST有所改变。 |
| [答：] |
Thank you for your advise.
1:St7540/38 has physicial layer advantage.ST7538 has been applied wide.
2:If you have any problems please contact us.0755-86012285 |
| [问：] |
7540为什么要将差分输出改为单端输出，有什么好处？ |
| [答：] |
The bigger advantage is to have a simpler interface to the Mains, so a simplification of board layout (only one power line) reducing the overall application cost. |
| [问：] |
75系列符合Homeplug什么标准？ |
| [答：] |
Homeplug specification is the standard for high-speed powerline networking.But ST7540 is only narrow-band device. |
| [问：] |
st7540价格（千片）是多少？ |
| [答：] |
please access this address to obtain our distributor information
http://www.stmicroelectronics.com.cn/stonline/address/distrib/index.htm |
| [问：] |
st7540具有链路层功能吗? |
| [答：] |
No,It only has function of physicial layer |
| [问：] |
ST7540零售及批量价格如何? |
| [答：] |
please access this address to obtain our distributor information
http://www.stmicroelectronics.com.cn/stonline/address/distrib/index.htm |
| [问：] |
ST7540是否可以载波语言信号 |
| [答：] |
No.The max baud rate is only 4800bps. |
| [问：] |
ST-7540是否有实际应用案例? |
| [答：] |
This is new product.But ST7538 has been applied on China market. |
| [问：] |
ST7540在性能上比ST7536有哪些优势？ST7540是否有在中国的典型居民区的测试数据？怎样解决在中国电网因没有强制要求接入电器的EMI性能条件下，可靠的传输数据。本人以前搞了3年多的ST7536，在实验室条件下测试效果非常好，但在现场应用上失败了，为此公司投入的200多万全部浪费了。 |
| [答：] |
The big advantages between ST7540 and ST7536 are the PLI interface integrated on IC, the increased sensisitvity (from 2mV to 250uV), the higher speed (1200 bps vs. 4800 bps) and a lot of auxiliary functions that you can read datasheet.
Since many devices in China didn't respect EMI directives, a solution can be to protect data integrity with a Foward Error correction scheme and to carefully design the application (filtering and PS must be very well designed).If you have other questions please contact 0755-86012311 |
| [问：] |
ST的电力线载波方式是什么 |
| [答：] |
FSK |
| [问：] |
传输距离能达到多远，容易受干扰吗？ |
| [答：] |
the ideal distance is 1km. |
| [问：] |
传输信号能通过变压器吗?(如高压转AC220的变压器)张晓华 |
| [答：] |
No,It only be transferred under one transformer |
| [问：] |
大负荷电流开关的干扰的处理 |
| [答：] |
The easiest way to solve current limitation issues is to:
- provide an optimal power dissipation of IC
- rise the current limitation treshold
- transmit short packets or increase communication speed to avoid thermal issues;
Another way is to use a 2:1 transformer in order to see an impedance four times bigger.
The drawback is that the output voltage becomes half its value, so to get the same signal on the mains the ST7540 has to generate a signal with double amplitude, and obviously worse harmonic distortion.
|
| [问：] |
电力载波的数据传输速率，最大能达到多少？ |
| [答：] |
The baud rate is 4800bps. |
| [问：] |
该芯片自身功耗多大？ |
| [答：] |
The current is only 5mA during receiving mode. |
| [问：] |
关于这款电力载波芯片组成的系统，对信号的传输距离的问题，最远能够传输多远，同时当传输线路中有一个或多个变压器时，对信号的传输影响如何？因为在电力传输过程中不可避免会有多个变压器 |
| [答：] |
the ideal distance is 1km.The signal could be tranferred through transformer. |
| [问：] |
可否用于汽车直流（12VDC）供电系统中，从而来替代车身系统的总线？ |
| [答：] |
It can be applied for 12VDC. |
| [问：] |
可以下载到此芯片的data sheet 吗？ 如何下载？在哪里可以购买到这个芯片。 |
| [答：] |
Please download from www.st.com/powerline |
| [问：] |
能否介绍一下保密和线路堵塞时的处理方法，能否使用于当量用户同时使用 |
| [答：] |
The internal register has been protected. |
| [问：] |
能否介绍一下芯片的价位 |
| [答：] |
please access this address to obtain our distributor information
http://www.stmicroelectronics.com.cn/stonline/address/distrib/index.htm |
| [问：] |
能否提供价格和供货渠道? |
| [答：] |
please access this address to obtain our distributor information
http://www.stmicroelectronics.com.cn/stonline/address/distrib/index.htm |
| [问：] |
能给我发一些电子资料吗?我自己看一看. |
| [答：] |
Please download from www.st.com/powerline |
| [问：] |
请把资料发过来!张晓华 |
| [答：] |
Please download from www.st.com/powerline |
| [问：] |
请教有关电力载波技术传输视频信号 |
| [答：] |
No.The max baud rate is only 4800bps. |
| [问：] |
请提供ST7540基本应用技术及典型应用电路。 |
| [答：] |
Please download from www.st.com/powerline |
| [问：] |
请提供资料，报价 |
| [答：] |
Please access www.st.com/powerline to obtain materials.
About price please contact our distributor. |
| [问：] |
请问：作少量按防工控数据传输，能否保障数据的安全性和适应网状网络？能否接力传输？
如可能，讷个否提供全套资料？
cn_kendall@126.com |
| [答：] |
It may be applied industial control system.
Please download materials from www.st.com/powerline |
| [问：] |
请问电力线载波技术在局端的处理,是否有大量的相应产品在使用.目前国内的应用状况如何?是否每个电力公司都在使用? |
| [答：] |
Yes .ST7538 has wide application on China market. |
| [问：] |
请问抗干扰能力如何？ |
| [答：] |
There are thermal shutdown and protection internal. |
| [问：] |
请问有应用举例吗？以供参考！ |
| [答：] |
Please download from www.st.com/powerline |
| [问：] |
請問單一迴路ST7540數量是否有限制?其長度限制又如何? |
| [答：] |
It is point to point.So you can connect many devices on net.the ideal distance is 1km. |
| [问：] |
如果需要在不同相线间通信，应采取哪些措施？ |
| [答：] |
It couldn't transfer between
different phase. |
| [问：] |
如何购买？谢谢。 |
| [答：] |
please access this address to obtain our distributor information
http://www.stmicroelectronics.com.cn/stonline/address/distrib/index.htm |
| [问：] |
是否可以提供电子版使用手册? |
| [答：] |
Please download from www.st.com/powerline |
| [问：] |
是否有中文数据手册？ |
| [答：] |
No,We only have English datasheet.
But if you have some problem please contact us. |
| [问：] |
通讯时最大支持的节点数？ |
| [答：] |
It is point to point.So you can connect many devices on net. |
| [问：] |
我是一家北京公司，想做电力载波用在电器智能化方面，能否发详细资料到 intradecn@yahoo.com.cn |
| [答：] |
Please download from
www.st.com/powerline |
| [问：] |
我是做业务的，我们的客户群体有很大一群是这个方面。
我想问的问题是：这个产品目前有没有开始量产，可以从那拿到货。
多谢！ |
| [答：] |
please access this address to obtain our distributor information
http://www.stmicroelectronics.com.cn/stonline/address/distrib/index.htm |
| [问：] |
芯片的价格如何？稳定性怎样？ |
| [答：] |
Please contact our distributor
to obtain price |
| [问：] |
芯片零售价多少？开发板售价多少？ |
| [答：] |
Please contact our distributor to obtain price |
| [问：] |
芯片因为集成了功放，请问芯片输出阻抗是多少？50 Ohm？ |
| [答：] |
50 Ohm |
| [问：] |
要使电力线载波信号同别的类型的网络进行互联时有几种方式 |
| [答：] |
I don't know your means.
If you have other questions please contact us |
| [问：] |
因为对于交流供电的弱电系统来说，有50周的工频干扰，我想载波也容易造成工频干扰，这样对其他系统来说，需要考虑这些频率的滤除了应该 |
| [答：] |
I think the carrier wave isn't
noise. |
| [问：] |
在哪里可以购买到7540
千片价格 |
| [答：] |
please access this address to obtain our distributor information.contact to them.
http://www.stmicroelectronics.com.cn/stonline/address/distrib/index.htm |
| [问：] |
这款芯片的成本如何，包括芯片价格，以及搭建一个系统所需的经费？ |
| [答：] |
Please contact our distributor to obtain price information |
| [问：] |
最低可用的信噪比是多少啊 |
| [答：] |
The minimum S/N (for a BER of 10e-3) of ST7540 is about 11.5dB. |
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