I have been playing around wit the oversampler on the output of the converter. I increased it from twice pixel rate to four times pixel rate, first linearly and then I used a couple of multipliers to give it a more sinusoid shape. I thought it was interesting to watch the over and under shots produced by the low pass filter in the video amp for each of the different types of oversampling.
Pictured below is first no oversampling, twice pixel rate oversampling, four times pixel rate oversampling liner and the final one is of four times pixel rate oversampling using the multipliers.
The scope is set to 0.1V/div. 0.2uS/div.
It is interesting to see there is not a big difference between twice pixel rate and four tines pixel rate linear.
Frank
Pictured below is first no oversampling, twice pixel rate oversampling, four times pixel rate oversampling liner and the final one is of four times pixel rate oversampling using the multipliers.
The scope is set to 0.1V/div. 0.2uS/div.
It is interesting to see there is not a big difference between twice pixel rate and four tines pixel rate linear.
Frank
