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 an appropriate output voltage to control {TAIL ~ the VCO} 16 and to move the PLL toward {HEAD ~ a phase locked state} 
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 an appropriate output voltage to control { TAIL ~ the VCO } 16 and to move the PLL toward { HEAD ~ 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 OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD