8. A method of operating an electrically programmable load having an impedance value dependent on a received control word, the electrically programmable load comprising a plurality of parallel load units, each load unit comprising at least one load unit element having a load unit element impedance value which depends on a control word component value of a respective control word component, the method comprising the steps of: providing said respective control word component to each load unit element, said control word component value being one of three or more different biasing values.
11. The method of operating an electrically programmable load according to claim 8 , wherein each of said each load unit elements comprises two voltage dependent capacitors.