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VCA2612: The bandwidth of VCA2612

Liu Hao
Intellectual 320 points
Part Number: VCA2612

Hi allI

I use  VCA2612 in my project ,and i test the bandwidth of it. but  i have some questions about the test result

My schematic just as below 

In my test, i find that when the input frequency increase to 25MHz, the  voltage will be greatly reduced 

The gain of LNA is 5db , MSG =000, and the Vctrl is 0.5V .

So does this is correct ？ i think the bandwidth is much lower than datasheet. So could you give me some advice?

Thanks 

  • 0
    Guru 140200 points

    Hi Liu,

    Liu Hao said:
    In my test, i find that when the input frequency increase to 25MHz, the  voltage will be greatly reduced 

    What does "greatly" mean? 1dB, 10dB? Do have any numbers? Scope plots?

    The -3dB bandwidth of VCA2612 is 40MHz and the frequency response can be seen in the figures on page 5 of datasheet. Are your measurments in conflict with these curves?

    Kai