数模混合信号前端的系统分割考虑ADI

简介：

问：欠采样技术是何时开始采用的？
答： It is widely used in wireless systems. And ADI is the leader in this field. AD9240, AD6644/5, AD9244 are the best examples for this.

问：模拟电路少不了基准电压源，如何减少对他的影响？
答： Treat it as the analog signal. And protect it. Take are of the grounding and power decoupling.

问：能不能说一下在PCB layout 时模拟和数字信号的一般布放原则，在你们的网站上什么地方可以找到相关的资料？
答： Please refer to section 7 of :
http://www.analog.com/technology/amplifiersLinear/training/highspeed.html

问：主持人：你好，请问模拟数字整合系统中的隔离问题如何解决？请示例。
答： You can use the ADuM1100, ADuM130X and
ADuM140X as the digital isolators.

问：能否进一步解释一下“系统级的集成化”和“硅片的集成化”
答： 硅片的集成化指的无论模拟还是数字部分都尽量集成在芯片上，而系统级的集成化是指在一系统的概念下对各个部分进行优化并集成。

问：多层PCB中如何布置模拟和数字器件?模拟和数字的接口如何处理较好?
答： At first, seperate the ground of every single PCB, place digital and analog devices seperatly, but use back-to-back Schottky diodes to connect the ground on board. Meanwhile, connect digital for all PCBs together, connect analog ground for all PCBs togethe

问：请问能否对AD7701的输出进行解释，我现在在异步传输UART的方式下，只能做到4K bount rate,请问能否更高一些。
答： AD7701的输出速率为4K，可以用高于4K的速率来读取数据

问：如何避免模拟和数字信号的相互干扰?
答： Use the sepeate analog and digital ground and try to decoupling the power suppliers.

问：如何处理传感器的微弱信号?是否需要屏蔽以防止干扰?还有别的好办公吗?
答： 关于传感器的微弱信号，我们有专门的一个文章介绍如何进行信号调理。请参考以下链接http://www.analog.com/technology/amplifiersLinear/training/sensorSignal.html

问：详细分割能否给出STB中的考虑来提高灵敏度和减少干扰?
答： Normall the digital ASIC or CPU have big power. Seperate the Analog/Digital mixed front end (AFE) can minimize the interface from the digital noise. THen higher SNR, higher sensitivity.