On 9/20/20 10:57 AM, Howard Fidel wrote:
I have been testing LPFs and found that I had filter characteristics that did not make sense. I had much more ripple in the filters then design and simulation showed. I added a 20 dB attenuator to the CH0 output and the problem disappeared. It seems that the drive capability maybe having problems driving the filter input capacitance?
what did the S11 look like without the pad?
What happens with a 10dB pad instead of the 20?
