数模混合信号前端的系统分割考虑ADI

简介：

问：如何尽量减少采样时钟对模拟信号的影响?
答： It is important to isolate the clock signal path from both analog and digital signal corruption.  This is particularly important in cases of high frequency signals.  This is typically done by 1. spacing signals as far apart as possible,

问：各位专家你好：
    针对alexie提出的检测装置能否提供一个参考设计？
    谢谢！
答： Would you please contact ADI via the toll-free number 800 810 1742 after the seminar?

问：主持人，你好，请问A/DC、D/AC在系统连接中数/模信号之间如何隔离？请举例说明。
答： Hi, this is a complicated question which can be a book length. Basically, you need to make sure power supply for digital and analog signal are through different ways and seperate them by proper distance, with less cross better; also  ground split

问：SOC集成数、摸模块与利用单片数、模IC对信号质量有什么区别？那种更好？

答： Discrete converters can usually provide higher performance than SOC solutions. There is a performance advantage to be gained by seperating analog and digital circuitry, but discrete solutions may not fit in the available space for the application. Integrat

问：请问:
前端的系统分割的出发点是什么?

答： ADI的智能划分方法是基于IC设计的技术和成本核算而制定的. 对于混合信号IC, 随着工艺尺寸的减小, 实际上功能、成本和功耗都可能增大. 而电源电压降低（减小）则会导致性能下降. 结果是, 工艺减小带来的成本下降不是非常有效, 可能还赶不上可能的数字IC成本下降. 若是设计片上系统ASIC, 则必须认真权衡(考虑)数字部分工艺的尺寸与混合信号性能之间的利弊(权衡).

问：请介绍一下系统的智能分割
答： 系统的智能分割的目的是以低成本实现最高的系统集成, 达到最高的性能指标, 最小的尺寸和最低的功耗.
    ADI 的 Othello 芯片组就是系统集成的一个很好的例子. 它提高了混合信号电路的集成度, 但并非单片SOC方案. 相比于低集成度的方案, 它可以使GSM手机的尺寸和元件数减小50%.
    它是通过提高系统级的集成化实现的, 而不是硅片的集成化.
   &n

问：请给汽车电子前段信号抗干扰及EMC处理方案
答： Most important is "shielding" of signal routine, also power supply de-coupling to drop interference should be taken care of. Auto-electronics is a very interesting field, you can call 800-810-1742 to our China support center, we"ll be glad t

问：问个不太相关的问题：我用AD2191来控制液晶显示的话，和一般的单片机控制有什么区别，要注意那些事情？
谢谢！！
答： Please send mail to china.dsp@analog.com, or call the toll-free number 800 810 1742. They will help you on this.

问：在ad73360前端，要采样的信号除了经过RC滤波，还要加采保报和运放吗，它内部的功能能不能不要像别的芯片那样呢？
答： No need, it has signal PGA in it.

问：ad73360的供电电压多少为最好，3V还是3.3V，如果用3.3V的话，会不会对ad73360的采样结果有影响。ad73360的内部参考输出电压正常情况下的偏差有多少？AD21992的参考输出电压的正常偏差有多少？这两种片子我是用内部参考电压好还是外部参考电压好一些呢？
答： Both 3V and 3.3V is OK for AD73360, if you use an LDO such as ADP3335 will be better.
The AD73360 reference is a bandgap reference that provides a low noise,temperature-compensated reference to the ADC. Min is 1.125V, Typ 1.25V, MAX 1.375V.
ADSP-2