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AD8317 output ripple suppression without increasing CFLT ?

Question asked by JAJA on Dec 1, 2017
Latest reply on Dec 2, 2017 by JAJA

Hi There:


We used AD8317 in our AGC loop at frequency 2GHz , and we found that CFLT must increas to 1nF to filter output ripple. However, it causes that the fall/rise time of AD8317 is too long to reach the steady state. Therefore, We want to find another way to filter the output ripple. There is some noise at 7.7GHz,3.8GHz,1MHz etc.Is it helpful if we add a 2GHz BPF at RF input port ?