Close or Esc Key

Arduino Projects   |   Raspberry Pi   |   Electronic Circuits   |   AVR   |   PIC   |   8051   |   Electronic Projects

Analog signal chain - Two point calibration

2 posts / 0 new
Last post
Alex's picture
Last seen: 2 years 1 month ago
Joined: 02/05/2017 - 08:35
Analog signal chain - Two point calibration

Hi all

My question regarding the subjet is related to the expected error you can get after you done offset and Gain calibration.

I have a simple signal chain which include a PGA  and  16 bit DeltaSigma ADC.

I can get very close values after calibration on each end of a ADC input range: 0 mv to 512 mv.

The  corrected values after using the Corrected_Gain and offset  are not very close to ideal Gain=1.

Near Full Scale the valus are good but the error increase down to cero volts.

Ther are error like INL which is  +/- 2LSB , but the error I get is big compared to 2 LSB.

I would appreciate  any help on that.



James's picture
Last seen: 5 months 2 weeks ago
Joined: 28/11/2018 - 10:35
you must take average of

you must take average of several codes....more will the number of samples less will be the gain error