nirc
Newbie level 2
- Joined
- Apr 13, 2010
- Messages
- 2
- Helped
- 1
- Reputation
- 2
- Reaction score
- 1
- Trophy points
- 1,283
- Location
- TEL - AVIV
- Activity points
- 1,297
Hi All,
I have designed a 8 bit SAR ADC. (1 LSB ~ 10 mV)
In order to test my DNL and INL, I have an outomatic system with ramp input.
(The input resolution is ~ 2mV - in order to reduce estimation errors)
My typical DNL is ~+/- 0.1 LSB and INL ~ +/- 0.2 LSB.
Every ADC has a transition noise with an associated transition region.
Due to the above I can see every ~ 500 (random) conversions 1 LSB toggle.
(The output code word goes up to the next code and immediately going down)
The DNL calculation depends by definition by the actual transition voltage.
Should I ignore this noise in my DNL / INL calculation?
Should I take the random transion noise in my estimation? if yes how?
Thank you.
I have designed a 8 bit SAR ADC. (1 LSB ~ 10 mV)
In order to test my DNL and INL, I have an outomatic system with ramp input.
(The input resolution is ~ 2mV - in order to reduce estimation errors)
My typical DNL is ~+/- 0.1 LSB and INL ~ +/- 0.2 LSB.
Every ADC has a transition noise with an associated transition region.
Due to the above I can see every ~ 500 (random) conversions 1 LSB toggle.
(The output code word goes up to the next code and immediately going down)
The DNL calculation depends by definition by the actual transition voltage.
Should I ignore this noise in my DNL / INL calculation?
Should I take the random transion noise in my estimation? if yes how?
Thank you.