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 {HEAD ~ the gate} of the first field effect transistor is tied to {TAIL ~ the gate} of the second field effect transistor, and a filter capacitor connected to the first field effect transistor for producing a capacitor voltage 
is tied to
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 { HEAD ~ the gate } of the first field effect transistor is tied to { TAIL ~ the gate } of 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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