e2V’s application note about dithering, adding noise to improve the dynamic range of ADCs. Link here (PDF)
High-speed ADCs today offer higher dynamic performances and every effort is made to push these state-of-the art performance through design improvements and also through innovative solutions at the system level.
For applications where the performance of the high-speed ADC in the frequency domain is the main critical parameter for the system overall performances, it is possible to improve the ADC response thanks to dither.
Dithering can be defined as adding some white noise, which has the effect of spreading low-level spectral components.
In this application note, the technique of dithering is presented, described and illustrated thanks to test results performed in the 10-bit 2.2Gsps ADC AT84AS008 device.