Hi all,
I ordered filters to cut out the ripple noise in a very poorly designed amplifier that I need to work. I didn't have the right equipment around, so I measured the ripple frequency at high impedance (straight into the scope, 1MHz) loading and ordered 50Ohm-matched filters hoping the ripple frequency wouldn't fall below the cutoff when the amplifier was connected to the 50Ohm load. Well, it did. Now I am trying to increase the loading on the amplifier output without losing too much signal due to mismatch. The signal band is DC-1MHz. The ripple occurs in numerous distinct peaks as low as 1MHz up to 12MHz. The filters the amplifier drives cutoff at 1.9MHz, and have 50Ohm input impedance.
My biggest constraint is time. I have only a few weeks to implement something. I was looking at an IC from Linear Tech (LTC6417), but it looks like it would take a fair bit of time to get it built correctly. I've also looked into impedance matching pads, but everything I find is for 50Ohm to 75Ohm conversion. Can anyone point me in the right direction? What products or parts should I be looking at? Any suggestions are appreciated. Thanks!
I ordered filters to cut out the ripple noise in a very poorly designed amplifier that I need to work. I didn't have the right equipment around, so I measured the ripple frequency at high impedance (straight into the scope, 1MHz) loading and ordered 50Ohm-matched filters hoping the ripple frequency wouldn't fall below the cutoff when the amplifier was connected to the 50Ohm load. Well, it did. Now I am trying to increase the loading on the amplifier output without losing too much signal due to mismatch. The signal band is DC-1MHz. The ripple occurs in numerous distinct peaks as low as 1MHz up to 12MHz. The filters the amplifier drives cutoff at 1.9MHz, and have 50Ohm input impedance.
My biggest constraint is time. I have only a few weeks to implement something. I was looking at an IC from Linear Tech (LTC6417), but it looks like it would take a fair bit of time to get it built correctly. I've also looked into impedance matching pads, but everything I find is for 50Ohm to 75Ohm conversion. Can anyone point me in the right direction? What products or parts should I be looking at? Any suggestions are appreciated. Thanks!