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OPA691: 压摆率限制了工作带宽

Part Number: OPA691
Other Parts Discussed in Thread: OPA355,

 请问OPA691这样配置,在IC 1处加入10MHz,功率为 0dBm 的测量阻抗信号,频率是否已经远超出其压摆率限制呢?对于OPA355,就更加困难了。

  • 您好,

    OPA691是电流反馈型运放,其带宽与增益无关,仅与反馈电阻有关。在大信号工作时,要考虑运放的压摆率SR是否满足要求,SR=2*Π*f*Vpp,即与工作的频率 f 和输出电压摆幅 Vpp有关。