Abstract: The low current level shifter stage of an oscillator circuitry having stable frequency response and low total current consumption over a wide range of supply voltage is comprised of a current switch, a differential to single ended converter (D/S), and at least one output stage. The low current level shifter is provided with differential input signals to improve the noise immunity such that stable frequency response over a wide range of supply voltage may be realized. The low current level shifter is current controlled such that low current consumption over a wide range of supply voltage may be realized. Specifically, the output stage of the low current level shifter has inverter circuitry which operates to lower the current consumption of the level shifter by not simultaneously turning on both NMOS and PMOS transistors of the output stages and by reducing the voltage levels within the output stages which must be switched.