I have some problem with separating capacitor C3. There is some distortions in videosignal, that you can see in the pictures.
Maybe you know the cause of this distortion?
Is there some way to solve this problem?
I use log detector (like AD8318) for pulse detection application. Applying detector output to ADC and which is sampled at 20MSPS and use this samples for further processing.
I use ADC part AD9051 in single ended ,DC coupled mode as shown below…
I use ADV3224 in my design.
Datasheet said, that this device drives 150 Ω loads. I have a video signal, Fsig=5 MHz, scheme of my design in file, I use highpass filter C=20uF R2=5,1KΩ series with ADA4430 after ADV3224 and after through potential…