{TAIL ~ a first variable capacitor} coupled to the first DAC and the first buffer, {HEAD ~ the capacitance value} of the first variable capacitor corresponding to the first control voltage; and 
{ TAIL ~ a first variable capacitor } coupled to the first DAC and the first buffer , { HEAD ~ the capacitance value } of the first variable capacitor corresponding to the first control voltage ; and
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH