Ramps

• A waveform corresponding to DAC = 0 can be subtracted the profile waveform (averaged waveform for each of the 16 DAC values).

• ADCpeak is computed using an optimal filtering or an alternative method.
  

• One obtains ADC vs. DAC dependence:

• A saturation plateau may be observed around 3000 ADC counts corresponding to the maximum possible 12-bit ADC value (4096) minus the pedestal value of around 1000.

• A parabolic interpolation on the non-saturationg points is used to extract the parameters R0, R1 and R2 of the parabolic ADC vs. DAC relation:

Alternatively, a linear parametrization was also used in the RTM method (SN-ATLAS-2005-054):