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  • 关于AD8630运放放大小信号问题

    arrow
    arrow

    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…

    • over 4 years ago
    • 放大器专区
    • 问答
  • RE: What is the current noise of the AD8630 at 1kHz

    ARoxas
    ARoxas

    Hi,

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

    • over 3 years ago
    • Amplifiers
    • Q&A
  • RE: 放大器选型

    hpkamen
    hpkamen

    可以考虑AD8630  ADA4528-1, 低失调电压,地失调电压温漂,

    由于带宽的限制,一颗运放往往无法满足要求

    http://www.analog.com/cn/products/amplifiers/operational-amplifiers/zero-drift-amplifiers/ad8630.html#product-overview

    http://www.analog.com/cn/products/amplifiers/operational-amplifiers/zero…

    • over 4 years ago
    • 放大器专区
    • 问答
  • RE: ad823an 4OPAMP single package

    KRZ
    KRZ

    Some suggestions:

    AD8608

    AD8694

    AD8630

    AD8604

    I'm assuming you meant TSSOP14

    • over 5 years ago
    • Amplifiers
    • Q&A
  • RE: 如何理解放大器的输出阻抗?

    ADIApproved
    ADIApproved

    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。

    • over 4 years ago
    • 放大器专区
    • 问答
  • RE: AD8628/29/30, thermopile application, power supply decoupling?

    harrynsc
    harrynsc

    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…

    • over 2 years ago
    • Amplifiers
    • Q&A
  • TAGS LIST: Amplifiers

    karinasmith
    karinasmith
    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…
    • over 2 years ago
    • Amplifiers
    • Documents
 
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