• ADA4530-1的仿真

    我用PSpice加载了ADA4530-1的.cir文件后,里面有buffer/ADA4530/Amplifier三个子电路,我想请问这几个电路分别的作用是什么?

  • ADA4530-1输出异常

    案例:使用ADA4530-1测量超低荧光信号,荧光信号(具有调制频率的脉冲信号,目的是通过隔直与后级检波滤除背景光造成的直流信号)经光电二极管转换后,电流强度在25pA~2nA之间,Rf=22M.输出

    问题:与荧光信号输入同时存在的自然光背景光(滤光片无法100%滤除),该背景光等效于一个较大的直流信号,当该信号强到使得DC输出最大即DC信号已失真时,ADA4530-1会输出一个固定的10-20mV,具有一定规律的脉冲信号,该脉冲信号远大于实际需求信号,直接把荧光信号完全淹没。只要直流信号放大后仍小于电源供电…

  • ADA4530-1的电路设计

    ADA4530-1的参考电路CN0407能够检测fA级电流,但电路中使用的开关ADG1419的漏电流为nA级,需要什么样的处理来避免ADG1419的漏电流对被测电流信号的影响?谢谢。

  • ADA4530-1损坏问题

    使用ADA4530-1作为光敏二极管的放大电路,采用垮阻方式,放大倍数为5GV/A由于没有超过1Gohm的电阻,于是用若干1Gohm电阻串联替代,同时并联上若干0.5pF的电容串。预估的-3dB带宽为0.5~1KHz量级。

    初次测试后信号显示的结果与设计相符合,由于某些器件参数需要调整,遂拆下电路板进行调整,可能是由于拆装过程中没有注意保护,导致上电之后信号显示以下不正常:

    1.使用与之前同一线性电源(AC220->DC5V,电源负极接地,电路屏蔽接地)供电时,信号上出现频率为100Hz左右的规律噪声…

  • ADA4530-1做电流灵敏时的压摆率问题

    我现在在用ADA4530-1做一个电流灵敏前置放大器,探测器输出的电流大小为2nA~60nA,脉冲宽度只有10ns左右,在仿真的时候总是出现压摆率不够的问题,请问有解决的方法吗?

  • ADA4530-1 Die level option

    Hi,

    Is it possible to get ADA4530-1 amplifier with die level "package"?

    If not, what is then the best amplifier with die level package if the critical parameters are:

    - IBias under 1pA and offset voltage as low as possible (this will be use…

  • Pin floating in ADA4530-1?

    Dear Support

    I have read everything I could about ADA4530-1.

    However I have still one important open question:

    In the ADA4530-1R-EBZ User Guide (UG-865) I observe
    that the Pin No 3 IS CONNECTED to the negative rail
    in conflict to the explicit statement…

  • offset trimmimg for ADA4530-1

    Hi, 

    I am using ADA4530-1 amplifier for TIA application. Measuring 10pA . How to do offset trimmimg is there possibility for the user to trim the offset? As there is digi trim in the wafer stage but can trim be done manually??

    I am using CN0407-1-SDPZ…

  • ADA4530-1的guard ring, RF shield怎么接?

    RF屏蔽壳必须接到低阻抗节点上(通常是地电势)。但ADA4530的手册中guard ring 好像接在一起。(参照UG-865,page 3 guard and shield)

  • RE: The circuit design of ADA4530-1

    Hi,

    Thank you for your query about the ADG1419 & the CN0407.

    The current in the circuit is measured by the ADA4530-1 Femtoampere Input Bias Current Electrometer Amplifier. Therefore the leakage of the ADG1419 does not have an effect on the low current…