A voltage controlled oscillator is supplied with {TAIL ~ a part} of {HEAD ~ the output} of the phase comparator which controls its oscillation frequency 
A voltage controlled oscillator is supplied with { TAIL ~ a part } of { HEAD ~ the output } of the phase comparator which controls its oscillation frequency
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH