Dynamic range of the ADC

Of course, these considerations regarding the folded spectra and decreased dynamic range of the ADC hold for any kind of 2D spectroscopy. We have mentioned them here because such problems happen to have been afforded in the NMR literature on paramagnetic compounds in connection with NOESY spectra. 

Sample rate. Number of samples acquired per second. For seismology, the usual rates are in the range 1-200 Hz, while for exploration seismology, sample rates can be more than 1,000 Hz. In general, the dynamic range of the ADC degrades with increasing sample rate, since its internal noise increases with bandwidth. 

The attenuation of the optical signal by a monolayer is small and the upper limit on S/N is usually determined by the dynamic range of the analog-to-digital converters (ADC) (9). A simple method to diminish the ADC limitation, and improve the S/N ratio would be to increase the amount of sample probed by the beam. Since the ADC peak-to-peak noise level for a single scan is -10-3 absorbance it may be necessary to average several... 

The dynamic range is the ratio obtained by deviding the intensity of the most intense signal by that of the weakest while both are correctly detected in the same spectrum. To improve the small dynamic range delivered by 8-bit ADCs (0-255) several tens to a few hundred single spectra are usually summed up. Slow scanning instruments are typically provided with 16-20-bit ADCs corresponding to intensity values of 0-65535 (2 -l) and 0-1048575 (2 °-l), respectively. 

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