Voltage dividing self-bias circuit

Voltage dividing self-bias circuit

◎Voltage-type self-bias circuit. The circle shown is a voltage-dividing self-bias circuit ,
also known as a gate- connected positive potential bias circuit. It is
based on a self-bias common source amplifier circuit and is composed of voltage -dividing resistors R and R.     In the figure, the power supply UDD, input coupling capacitor cl, output coupling capacitor C2, drain resistor R, source resistor Rs, source bypass capacitor C; all have the same function as the self-biased common source amplifier circuit. Rti and R丶 are voltage-dividing bias resistors, and the contact point between Rn and R is connected to the gate through a large resistor Rf. Since there is no current in the gate insulation, the voltage dividing point A of Rn and R is at the same potential as the gate . Since this circuit has both "voltage -divided bias" and "self-supplied bias", it is also called a group bias circuit. This bias circuit can be used for depletion mode field effect transistors or enhancement mode field effect transistors.