The error voltage represents the magnitude and {HEAD ~ sign} of {TAIL ~ the difference} between the actual and the required common power component 
The error voltage represents the magnitude and { HEAD ~ sign } of { TAIL ~ the difference } between the actual and the required common power component
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH