A floating current source configured to source a load biasing current through a load having first and second terminals (14, 16) coupled to source and sink terminals of the floating current source, respectively, said floating current source comprising: a first transistor having a first terminal operative as a first transistor biasing input, a second terminal coupled to a reference, and a third terminal coupled to the second terminal of the load and operative as the sink terminal; a first biasing network coupled to the first transistor biasing input; a second transistor having a first terminal operative as a second transistor biasing input, a second terminal coupled to a voltage supply for drawing the load biasing current, and a third terminal coupled to the first terminal of the load and operative as the source terminal; and a second biasing network coupling the second transistor biasing input to the source terminal so as to automatically adjust the float voltage so that the magnitude of the load biasing current sourced from the voltage supply matches the magnitude set by the first biasing network; wherein the second biasing network comprises a resistor connecting the third terminal of the second transistor to the first terminal of the second transistor,; characterised in that: the first biasing network comprises a series resistor connected as a series resistance into the first terminal of the first transistor, the first biasing network being configured to receive an input biasing signal and to generate a first transistor biasing signal that sets a magnitude of the load biasing current; and the second biasing network comprises a capacitor coupling the first terminal of the second transistor to the voltage supply as an AC shunt thereby preventing AC fluctuations at the first terminal of the load from affecting the load biasing current. a first transistor having a first terminal operative as a first transistor biasing input, a second terminal coupled to a reference, and a third terminal coupled to the second terminal of the load and operative as the sink terminal; a first biasing network coupled to the first transistor biasing input; a second transistor having a first terminal operative as a second transistor biasing input, a second terminal coupled to a voltage supply for drawing the load biasing current, and a third terminal coupled to the first terminal of the load and operative as the source terminal; and a second biasing network coupling the second transistor biasing input to the source terminal so as to automatically adjust the float voltage so that the magnitude of the load biasing current sourced from the voltage supply matches the magnitude set by the first biasing network; wherein the second biasing network comprises a resistor connecting the third terminal of the second transistor to the first terminal of the second transistor,; characterised in that: the first biasing network comprises a series resistor connected as a series resistance into the first terminal of the first transistor, the first biasing network being configured to receive an input biasing signal and to generate a first transistor biasing signal that sets a magnitude of the load biasing current; and the second biasing network comprises a capacitor coupling the first terminal of the second transistor to the voltage supply as an AC shunt thereby preventing AC fluctuations at the first terminal of the load from affecting the load biasing current. the first biasing network comprises a series resistor connected as a series resistance into the first terminal of the first transistor, the first biasing network being configured to receive an input biasing signal and to generate a first transistor biasing signal that sets a magnitude of the load biasing current; and the second biasing network comprises a capacitor coupling the first terminal of the second transistor to the voltage supply as an AC shunt thereby preventing AC fluctuations at the first terminal of the load from affecting the load biasing current.