显示页面讨论修订记录反向链接回到顶部 本页面只读。您可以查看源文件,但不能更改它。如果您觉得这是系统错误,请联系管理员。 <html> <head> <meta charset="utf-8"/> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="renderer" content="webkit"/> <meta name="author" content="mubu.com"/> </head> <body style="margin: 50px 20px;color: #333;font-family: 'Helvetica Neue','Hiragino Sans GB','WenQuanYi Micro Hei','Microsoft Yahei',sans-serif;"> <div class="export-wrapper"><div style="font-size: 24px; padding: 20px 15px 0;"><div style="padding-bottom: 10px">树莓派高速ADC采集模块</div><div style="background: #e5e6e8; height: 1px; margin-bottom: 20px;"></div></div><ul style="list-style: disc outside;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">背景</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">项目来源 - 52Pi</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">市面上还没有基于树莓派的高速ADC采集卡/示波器</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">基于树莓派做一款开源示波器会是一个比较好的平台,DIY示波器是很多硬件工程师都感兴趣的技术点</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">树莓派HAT的大小能够支持双通道高速示波器</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">已经有开源的、运行在浏览器里的示波器软件运行在浏览器里</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">也可以用Python编写示波器的界面</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">大致需求分析:</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">功能 - 通用双通道、高速采集的数字示波器</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">采用2通道、50-100Msps的ADC</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">模拟带宽限定在20MHz,对于一个原型的HAT够用了</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">如果实际的场景要求采集更高模拟带宽的信号,可以使用100Msps的ADC,通过FPGA内部的逻辑变换不同的采样时钟相位采集,来达到更高的等效采样,比如FPGA内部的时钟频率能够工作在400MHz,则可以产生2.5ns间隔的相位时钟,达到400Msps的采样,在这种情况下模拟带宽可以到100MHz</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">但越高的采样率和分辨率,对采样时钟的抖动要求越高,需要非常低抖动的时钟源,并且在布线的时候要高度注意电源的去偶等,否则用了高性能的ADC器件,实现不了高性能。</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">分辨率?8、10、12、14bit?</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">分辨率高 - 前面的模拟链路简单,但成本高</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">分辨率低 - 前面的模拟链路需要处理比较宽的动态范围,ADC的成本低</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">接口方式?</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">CMOS vs LVDS ?基于器件的价格、封装进行考虑</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">功耗:</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">越低越好,与供电电压有关</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">电压?</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">3.3V vs 3.3V&1.2V?最好只用3.3V的供电,简化电源的设计,尤其是模拟电压部分</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">可以选用以下厂商的器件</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">TI:ADS4225/ADS4245:<a class="content-link" target="_blank" href="http://www.ti.com/product/ADS4225" style="text-decoration: underline; opacity: 0.6; color: inherit;">http://www.ti.com/product/ADS4225</a></span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">ADI:</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">Maxim Integrated:</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">折中一下,基于性能、价格等因素考虑,可以选用双通道、12bits、125Msps的ADC - ADS4225 <span class="tag" style="text-decoration: underline; opacity: 0.6; color: inherit;">@TI</span> <a class="content-link" target="_blank" href="http://www.ti.com/product/ADS4225" style="text-decoration: underline; opacity: 0.6; color: inherit;">http://www.ti.com/product/ADS4225</a>,使用这个器件有很大的灵活性,用同样的封装可以支持4种不同的选择,分不同档次的产品,根据实际的应用场景使用相应的ADC器件。</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">采样率可以是低速的65Msps,便宜</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">分辨率可以是14bits的ADS4245</span></li></ul></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">接口方式 - 40Pin的GPIO接口</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">高速数据传输,只能用其中的SPI接口信号 - 50Mbps?</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">必须采用FPGA进行缓存,将2* 12bits * 100Msps的数据流存入FPGA内部的SRAM,然后树莓派通过SPI总线读取出来。那么对FPGA的要求是什么?</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">存储的需求 - 如果内部的BLOCK RAM够用,可以通过将其配置成FIFO、双口SRAM、环形SRAM等用于采集数据的缓存,如果内部的SRAM不够,可以外接一个SRAM芯片</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">RAM的大小取决于需要存储下来的一次采集的采样点的个数,比如16KB的RAM可以存储16K*8/12位/2 ~ 5K个采样点</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">其实12位的精度是为了实现更宽的动态范围,8bit的显示已经足够了,也就是说FPGA通过SPI总线送到树莓派的用8bit的数据就能满足系统的要求了,可以在FPGA内部根据模拟信号的输入幅度进行动态调整,对输入的12位处理成8位,送出来,在FPGA内的数字动态范围达到2^4 ~ 24dB</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">12bit ~ 8bit的选取可以在进入到RAM之前,因此16KB的RAM可以存储8K个采样点</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">接口的要求:</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">考虑到选取的ADC的接口有并行接口(封装大)、串行LVDS接口(封装小),LVDS还有抗干扰能力强的有点,因此最好FPGA芯片能够支持LVDS接口</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">速度:100Msps的时钟,现在的FPGA都能搞定</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">封装 - 4层板要比2层板价贵费用多出很多,且BGA封装的器件加工成本高,调试困难,因此QFP的器件较好</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">供电 - 如果单一路的3.3V能够搞定,就免去1路低压供电了,但如果ADC需要的低压数字供电与FPGA的内核电压一致,也可以选择带低压供电的FPGA器件</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">FPGA配置的PROM</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">HAT板上上电配置 - 简单,有可能增加EPROM的成本</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">每次上电由树莓派通过GPIO来配置FPGA - 慢,且开发麻烦</span></li></ul></li></ul></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">动态范围</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">最小5mVpp,最大50Vpp - 动态范围为80dB</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">12bits的ADC能够提供的动态范围为70dB(等效)</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">模拟链路需要10dB以上的动态范围调节</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">在探头的输入端需要加一个20dB的衰减,将50Vpp降为5Vpp</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">后续的模拟电路需要提供20dB ~ 30dB的增益</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">在模拟链路中还会有LPF,导致信号的衰减,这些因素都要考虑在内</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">如果采用10bits的ADC,模拟链路需要增加12dB,也就是总体上模拟链路至少要22dB的变化范围</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">如果采用8bits的ADC,模拟链路需要增加24dB,也就是总体上模拟链路至少需要34dB的变化范围</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">供电</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">数字供电 - 3.3V/1.8V或1.2V</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">模拟链路供电 - +5V/-5V或+3.3V/-3.3V,模拟链路的供电电源需要通过开关变换以后再经过LDO得到</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">时钟部分 - FPGA内部的锁相环?ADC部分需要单独给时钟供电?看所选器件的数据手册</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">模拟接口</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">SMA?</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">SMB?</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">BNC?</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">板卡物理要求</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">大小</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">HAT标准尺寸</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">层数</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">2层 - 成本低,但性能未必能够保证</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">4层 - 加工成本较高,性能较好</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">接插件 - </span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">定位孔 -</span></li></ul></li></ul></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">方案设计</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">选用PCB工具软件</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">Altium Designer:</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">Eagle:</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">KiCad:</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">选用器件:</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">FPGA</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">ADC</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">模拟运放</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">模拟开关</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">电源</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">模拟信号接口</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">方案框图</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">指标分配</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">模拟动态范围</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">数字动态范围</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">数据接口协议定义</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">详细的设计</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">元器件库</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">原理图设计</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">PCB设计</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">Gerber文件</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">BOM清单</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">参考资料</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">现有的数据采集方案</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">Arrow的BeScope:</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">技术资料:</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">购买渠道:</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">NI/Digilent的Analog Discovery II</span><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">技术资料:</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">购买渠道:</span></li></ul></li><li style="line-height: 22px;"><span class="content mubu-node" images="%5B%7B%22id%22%3A%222be169671d49ed10c-2603805%22%2C%22uri%22%3A%22document_image%2Fbfe987cc-0591-4ab2-b078-3deb8a597d7b-2603805.jpg%22%2C%22ow%22%3A433%2C%22oh%22%3A289%7D%2C%7B%22id%22%3A%22e7169672276370ae-2603805%22%2C%22uri%22%3A%22document_image%2Fe2564385-dd8f-4780-9334-0ff8e5b32dc5-2603805.jpg%22%2C%22ow%22%3A695%2C%22oh%22%3A413%7D%5D" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">MiniDSO DS213:</span><div style="padding: 3px 0"><img src="https://mubu.com/document_image/bfe987cc-0591-4ab2-b078-3deb8a597d7b-2603805.jpg" style="max-width: 720px;" class="attach-img"></div><div style="padding: 3px 0"><img src="https://mubu.com/document_image/e2564385-dd8f-4780-9334-0ff8e5b32dc5-2603805.jpg" style="max-width: 720px;" class="attach-img"></div><ul class="children" style="list-style: disc outside; padding-bottom: 4px;"><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">技术资料:<a class="content-link" target="_blank" href="http://minidso.com" style="text-decoration: underline; opacity: 0.6; color: inherit;">http://minidso.com</a>,连同其它几个型号的技术资料和讨论社区</span></li><li style="line-height: 22px;"><span class="content mubu-node" style="line-height: 22px; min-height: 22px; font-size: 14px; display: inline-block; vertical-align: top;">购买:<a class="content-link" target="_blank" href="https://www.seeedstudio.com/MiniDSO-DS213-Nano-4-Channel-100MSa-s-p-2891.html" style="text-decoration: underline; opacity: 0.6; color: inherit;">https://www.seeedstudio.com/MiniDSO-DS213-Nano-4-Channel-100MSa-s-p-2891.html</a></span></li></ul></li></ul></li></ul></li></ul></div> </body> </html>