The first circuit uses {HEAD ~ the clock signal} received at {TAIL ~ the first input node} to control the frequency of the oscillator 
received at
The first circuit uses { HEAD ~ the clock signal } received at { TAIL ~ the first input node } to control the frequency of the oscillator
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH