TIDM-1019: ADC capture

Hi Divya,

1. The capture itself looks good, but I'd recommend starting the ADC capture sooner to center the waveform more. Try decreasing the ADC gap start value by about 3us. 

2. Can you clarify where exactly in your capture you see the attenuation?

Thanks,

Mitch

Mitch,

Well i have marked the points with attenuation.

Best regards,

Divya Harikumar

Hi Divya,

What you are seeing are artifacts of the sample rate you are using. This is normal and the capture itself looks good! If you wanted to clean up the signal, you can interpolate the data by exporting the capture data to a .csv file and importing it to Matlab. In Matlab, you can interpolate the signal.

Thanks,

Mitch

Hi Mitch,

I have a couple of questions 

1)Which is a better ADC capture (A) or (B) and why?

2) It was suggested that i should reduce the ADC gap start  .Is there any other importance of reducing gap between pulse start and ADC capture?

Regards,

Divya Harikumar

Hey Divya,

1. Your waveform is more centered in A, so I would say this capture is "better". Besides your ADC gap start parameter, are there any other parameters that are different between the two captures?

2. Reducing the gap between pulse start and ADC capture will center your capture more. This is important because as temperature varies, you will notice your capture will shift left or right, depending on if temperature increases or decreases. Centering your captures initially will help alleviate this effect.

Thanks,

Mitch

Hey Mitch,

There are a few parameter changes besides ADC gap start.

For, Waveform A: Capture duration = 60us , no:of pulses=30 and ADC gap start = 57us whereas

       Waveform B: Capture duration = 50us , no:of pulses=25 and ADC gap start = 60us

Is waveform A still a better choice of ADC waveform?

Best Regards,

Divya Harikumar