A circuit and method include using a first source follower of a first type to receive a first voltage from a first node and output a first current to a third node; using a second source follower of a second type to receive a second voltage from a second node and output a second current to the third node; using an AC (alternate current) coupling capacitor to couple the first node to the second node; using a feedback capacitor to couple the third node to the first node; using a shunt capacitor to shunt the third node to an AC ground; using a crystal to shunt the first node to an AC ground; providing a first bias voltage to the first node via a first DC (direct current) coupling resistor; and providing a second bias voltage to the second node via a second DC coupling resistor.