That is to say, they all contain multiple current switches that are controlled to add charge to or remove charge from a downstream circuit, which as a consequence generates {HEAD ~ an appropriate output voltage} to control {TAIL ~ the VCO} 16 and to move the PLL toward a phase locked state 
to control
That is to say , they all contain multiple current switches that are controlled to add charge to or remove charge from a downstream circuit , which as a consequence generates { HEAD ~ an appropriate output voltage } to control { TAIL ~ the VCO } 16 and to move the PLL toward a phase locked state
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH