To improve accuracy of the measurements where an analogue to digital converter is used the current signal, and {HEAD ~ optionally the supply voltage signal}, is perturbed by {TAIL ~ a Quantisation Error Dispersion signal} 
is perturbed by
To improve accuracy of the measurements where an analogue to digital converter is used the current signal , and { HEAD ~ optionally the supply voltage signal } , is perturbed by { TAIL ~ a Quantisation Error Dispersion signal }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL