Quote:
Originally Posted by FRANK.C
Hi again Semir
Just wondering how the THS7314 video amplifier preforms with 819 lines.
Does it's 8.5 MHz low pass filter have any noticeable effect on the video? I suspect not.
Frank
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Hi Frank,
Before using the THS7314 I had built a simple adder network to get the luminance signal. I can not see any difference between this solution and the simple one. Since my TVs are of later build their IF bandwidth is limited at around 6Mc which poses the real bottleneck in the signal chain. So no the THS 7314 works fine in this application. The only effect I could see was in the H-sync this had some ringing which I had not noticed in the simple solution. I added the 1kΩ/33pF LPF to reduce high frequency content in the sync and then it passed through the THS7314 without exhibiting the ringing.
I do have a friend with an older French TV that may have the full 10Mc bandwidth. When he gets it repaired I will check it out. I do need to get some test cards though to be able to better judge the resolution.
Cheers
Semir