QI have a query about the AD9910EVB. I found that the component values of the
output 400MHz filter on this board is not same as his simulation values. What
they considered is a 0.001dB inband error with a 50 Ohm impedance filter. The
numbers they calculated are as follows:
However, the values on our EVB are:
So, we are wondering why there exists some difference between them. Is there
some other consideration.
Would you mind sharing your experience on this question.
AMost times we use 0.01dB for pass band ripple, not 0.001db. Also we round the
capacitors values to the closest value we have in stock.
Those two things are probably the difference.