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