• 关于AD8630运放放大小信号问题

    我这边设计一个传感器信号放大电路,使用AD8630(单电源),传感器的输出信号频率为225kHz,幅度Vpp约为15mV,运放设计为放大10倍,发现运放的输出端没有输出放大后的信号。将放大倍数改为100倍也一样,将传感器信号改为30kHz,也是一样没有放大后的信号。不知是什么原因,自己猜测:

    1、是不是AD8630高频响应不好?

    2、是不是AD8630的输入端对小信号响应不好,不是JFET型的?输入的信号幅度太小了?

    3、应该用正负电源??

        如果AD8630不合适,该选择什么样的运放,重点看运放的哪些指标…

  • RE: What is the current noise of the AD8630 at 1kHz

    Hi,

    I will check if there is available data or graph for AD8630 current noise.

  • RE: ad823an 4OPAMP single package

    Some suggestions:

    AD8608

    AD8694

    AD8630

    AD8604

    I'm assuming you meant TSSOP14

  • RE: 如何理解放大器的输出阻抗?

    没错,是这样的,闭环增益越大,β越小。您可以看一下其他的数据手册,也是这个规律,比如AD8630。

  • RE: AD8628/29/30, thermopile application, power supply decoupling?

    John,

      A couple more comments.

    Op amps have a finite output impedance, so any C load will result in phase shift, degrading

    loop stability.  The AD8630 only has about 45 degrees phase margin on 2.7V, so a cable

    a foot or so long can be problematic.  I would…

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  • Single supply, PDIP Op-Amps

    Hi everyone!

     

    I'm new here so bare with me!

     

    I'm looking for an op-amp with similar features/specs to the ADA4051, but in a PDIP packaging (throughhole/breadboard size). I have attached the data-sheet for the ADA4051, but my basic requirements…