A method of providing an impedance match for an integrated semiconductor
circuit to other microwave elements is provided by allowing the selection
of one of a plurality of impedance matching ratios between the circuit
and other elements. The tunable impedance match comprises a microwave
impedance transformer with at least a single primary winding, and a
plurality of secondary windings, wherein the winding configuration is
determined by an electrical switching apparatus allowing the secondary
windings to be connected in series, parallel and combinations thereof to
provide the required impedance matching. The method allows for both
dynamic matching of an integrated semiconductor circuit for increased
efficiency, and hence reduced power consumption, and directly matching
said circuit to high impedance antennae etc.