ADL5382: frequency response

Discussion created by Mr.K on Mar 29, 2016



I am evaluating the characteristic by using the evaluation board of Figure 60 in the ADL5382 datasheet.

I will use the device by the bandwidth from 10KHz to 40MHz.


To confirm the frequency response, I removed the transformer of T2 and T3 from the board.

Because the transformer doesn't support the frequency response.


Under such a condition, I evaluated the frequency response.

I expected a flat characteristic from DC to 40MHz.

But, when the signal of 0.5MHz was input, the output of Q signal attenuated 1.7dB.


In this board, why does a low frequency band attenuate?


Best Regards,