An envelope tracking (ET) current bias circuit comprises an envelope detection circuit detecting an ET voltage from an input signal; a first voltage/current converting circuit converting a reference voltage into a direct current (DC) current and adjusting the DC current according to a first control signal; a second voltage/current converting circuit converting the ET voltage into an ET current, adjusting the ET current according to a second control signal, and removing a DC offset current from the ET current to provide an offset compensated ET current; and an arithmetic circuit calculating levels of the offset compensated ET current and the DC current to generate an ET bias current.