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LMH6626: Questions about the gain of LMH6626 amplifier circuit

Zhong Taojun
Prodigy 20 points
Part Number: LMH6626

Tool/software:

Dear TI engineers:

I designed an amplifier circuit with LMH6626, the schematic diagram is shown below.

The theoretical gain should be 100 times, but in the actual test the gain is only about 12 times, which is so far off that I am confused

Inout voltage = 10mV(50 Ohm),Output voltage = 114mV

How can I modify the circuit to achieve 100x gain?

Thanks

Zhong Jun

  • 0
    TI__Genius 14141 points

    Hello Zhong,

    I am supporting your question.

    Could you measure and confirm the 2.5V bias on each amplifier input?

    You may also try using larger Rf and Rg resistors, such as 10kOhm and 1kOhm.

    I will examine possible causes for your circuit behavior.

    Best,

    Alec