As noted above, {TAIL ~ these abruptly operated current switches} may introduce noise components that affect operation of the PLL, especially at {HEAD ~ higher frequencies} 
As noted above , { TAIL ~ these abruptly operated current switches } may introduce noise components that affect operation of the PLL , especially at { HEAD ~ higher frequencies }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD