The loop filter in the phase lock loop circuit comprises a reference precision resistor, a first field effect transistor and a second field effect transistor, wherein the gate of {TAIL ~ the first field effect transistor} is tied to the gate of {HEAD ~ the second field} effect transistor, and a filter capacitor connected to the first field effect transistor for producing a capacitor voltage 
The loop filter in the phase lock loop circuit comprises a reference precision resistor , a first field effect transistor and a second field effect transistor , wherein the gate of { TAIL ~ the first field effect transistor } is tied to the gate of { HEAD ~ the second field } effect transistor , and a filter capacitor connected to the first field effect transistor for producing a capacitor voltage
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