A circuit comprising: a balun configured to receive a radio frequency signal at a first input port and a second input port of an input coil and configured to output the RF signal at an output coil communicatively coupled to the input coil; a supply voltage selector circuit coupled to the input coil and configured to adjust a bias voltage at the input coil based at least partially on a power level of the RF signal received at the input coil such when the RF signal power is reduced, the bias voltage is lowered, and when RF signal power is raised the bias voltage is raised; a mixer with an output coupled to the input coil of the balun and configured to modulate a data signal onto a carrier signal to generate the RF signal and communicate the RF signal from the output of the mixer to the input coil of the balun; and a current source coupled at the output of the mixer and configured to source current to the mixer to at least partially bypass an internal resistance between the output of the mixer and the input coil of the balun to reduce power consumption associated with the internal resistance; a voltage to current (V-I) converter coupled at an output of the V-I converter to an input of the mixer and configured to convert the data signal from a voltage data signal to a current data signal and communicate the current data signal from the output of the V-I converter to the input of the mixer; and a current source (224, 226) coupled at the output of the V-I converter and configured to source current to the V-I converter to at least partially bypass an internal resistance between the output of the V-I converter and the input of the mixer to reduce power consumption associated with the internal resistance. a balun configured to receive a radio frequency signal at a first input port and a second input port of an input coil and configured to output the RF signal at an output coil communicatively coupled to the input coil; a supply voltage selector circuit coupled to the input coil and configured to adjust a bias voltage at the input coil based at least partially on a power level of the RF signal received at the input coil such when the RF signal power is reduced, the bias voltage is lowered, and when RF signal power is raised the bias voltage is raised; a mixer with an output coupled to the input coil of the balun and configured to modulate a data signal onto a carrier signal to generate the RF signal and communicate the RF signal from the output of the mixer to the input coil of the balun; and a current source coupled at the output of the mixer and configured to source current to the mixer to at least partially bypass an internal resistance between the output of the mixer and the input coil of the balun to reduce power consumption associated with the internal resistance; a voltage to current (V-I) converter coupled at an output of the V-I converter to an input of the mixer and configured to convert the data signal from a voltage data signal to a current data signal and communicate the current data signal from the output of the V-I converter to the input of the mixer; and a current source (224, 226) coupled at the output of the V-I converter and configured to source current to the V-I converter to at least partially bypass an internal resistance between the output of the V-I converter and the input of the mixer to reduce power consumption associated with the internal resistance.