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Hi,

As below,based on LT6204 datasheet, we know that its gain bandwidth is 100MHz.It shows that the used frequency is 1MHz,Is this frequency input signal frequency or input signal bandwidth? Are there any difference between them? And how to test amplifier bandwidth, would you please give me more approaches?

Thanks!

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  • Hello,

    I think the 1MHz here is the input signal bandwidth and this is the frequency used from the Open-Loop Gain Vs. Frequency
    plot to determine the Gain.
    From the Open-Loop Gain plot, if you will set 1MHz, the corresponding gain for Vs = +/-5V, is 40dB.
    At 10Mhz, the plot gives you a gain of 20dB.
    Therefore, your Gain Bandwidth Product is 100.

    You can validate the Gain Bandwidth Product in LTSpice.
    For example, set a non-inverting circuit and sweep an AC signal across frequency and locate the -3dB.

    For may example circuit below, the gain is 40dB.
    At -3dB, the frequency is ~1MHz, so that gives the LT6202 a GBP of 100.

    Thanks and regards.

Reply
  • Hello,

    I think the 1MHz here is the input signal bandwidth and this is the frequency used from the Open-Loop Gain Vs. Frequency
    plot to determine the Gain.
    From the Open-Loop Gain plot, if you will set 1MHz, the corresponding gain for Vs = +/-5V, is 40dB.
    At 10Mhz, the plot gives you a gain of 20dB.
    Therefore, your Gain Bandwidth Product is 100.

    You can validate the Gain Bandwidth Product in LTSpice.
    For example, set a non-inverting circuit and sweep an AC signal across frequency and locate the -3dB.

    For may example circuit below, the gain is 40dB.
    At -3dB, the frequency is ~1MHz, so that gives the LT6202 a GBP of 100.

    Thanks and regards.

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