谢谢您的答复,我发现ADA4075-2好像不行,它是高压放大器;我们选用了AD8613,电路图如下所示,是否正确,期待您的答复
Klaus san
Thank you for your reply, and apologize for that reply becomes slow.
I drew the easy circuit diagram in the attachment.
In the case of ADG5208F's VDD : 24V, I think it has Ron about 450 ohm (typ.).
So it current is 5V/ 450ohm = 11mA…
Hi Robert,
We have reference circuit for high impedance sensor as shown below though it uses opamps instead of inamps. Opamps use for this type of applications are AD8603, ADA466,1 AD4505 and AD8613.
你好,推荐使用AD8603,这款放大器的最大偏置电流及最大输入失调电流分别为1pf和0.5pf,可以满足测量1nA电流的需要。其它的放大器还有AD8605,AD8607,AD8609,AD8613,AD8615,AD8627等也可满足你的应用需求。I-V转换电路可以参考本论坛中西安交大知名教授杨建国最新力作——《你好,放大器》(电子书下载地址http://h.analog.com/China_ebook_hello_amp)中的161页运放检测电路方案。
参考电路图如下:
Carlpiro,
As Kaung said, it's best if you can run the AD820 on 5V min. I'm retired from ADI, but used to be in the op amp group.
The problem with JFETs is the two to one or three to one variation in Vp and IDss. If you look at the schematic…
AD600 |
AD602 |
AD603 |
AD604 |
AD605 |
AD8264 |
AD8330 |
AD8331 |
AD8332 |
AD8334 |
AD8335 |
AD8336 |
AD8337 |
AD8338 |
ADL5246 |
ADL5330 |
ADL5331 |
LTC6412 |
HMC6187G |
HMC997G |
HMC996 |
HMC694G |
AD8368 |
AD8351 |
AD8367 |
AD75071 |
AD552… |
专家经验分享:宽动态范围的高端电流检测的三种解决方案 by ADI_Amy
在电机控制、电磁阀控制、通信基础设施和电源管理等诸多应 用中,电流检测是精密闭环控制所必需的关键功能。如何设计宽动态范围的高端电流检测电路,这对于大多数工程师来说都具有挑战性,这里分享由ADI技术专家Neil Zhao、Wenshuai Liao 和Henri Sino提供的几个建议电路供大家参考。
将按照设计复杂度从高到低的顺序介绍三种可选解决方案,它们能针对各种不同的应用提供可行的高精度、高分辨率电流检测。
1. 使用运算放大器…