Issues when use AD8001 as Adder

Hello Guys,

We are using AD8001 as Adder. We can use it in our previous product, now, we are using it in our new prototype and test board. We didn't change anything in the schematic, only replace and route a test board. As attached imag file shows, there are something like ripples coupling into the Adder's output. What happens on the AD8001?

We have isolated the next stage, and nothing change. The input signal is exponent from function generator, and across AD8264(VGA), then input to AD8001. We also input sine, square and sawtooth signals. It seems the low speed signal can get better result. The output imag as below(violet channel is VGA's output, and blue channel is AD8001's output):

Thanks in advance.

Jerry

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  • Hi Jino,

    Here is the AD8001 part schematic, do you need other parts?

    PS: The same circuit can work well in our previous board. This test board is just used to test VGA part - AD8264, unfortunatly, we all don't think the issue happens on AD8001. Below is the test rusut in our previous board, AD8001's output is wondful(violet channel is the AD8001's output, yellow channel is the input signal).

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  • Hi Jino,

    Here is the AD8001 part schematic, do you need other parts?

    PS: The same circuit can work well in our previous board. This test board is just used to test VGA part - AD8264, unfortunatly, we all don't think the issue happens on AD8001. Below is the test rusut in our previous board, AD8001's output is wondful(violet channel is the AD8001's output, yellow channel is the input signal).

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