Patent ID: 7053728

Claim:
An impedance transformation network comprising: an input node to receive an output signal; an output node to transmit the output signal; a fixed impedance transformation circuit connected between the input node and the output node, the fixed impedance transformation circuit being configured to provide a fixed impedance transformation to partially transform a first impedance at the output node to a second impedance at the input node; and a varactor device connected in series on a signal path from the input node to the output node, the varactor device being configured to provide a variable impedance transformation in response to a power level of the output signal to partially transform the first. impedance at the output node to the second impedance at the input node, wherein the fixed impedance transformation circuit includes at least one transmission line on the signal path and at least one shunt capacitor connected to the signal path, the fixed impedance transformation circuit further including at least one additional transmission line on a second signal path between a supply voltage terminal and the signal path and at least one additional shunt capacitor connected to the second signal path, the second signal path at least partially being used to supply DC bias voltage to the varactor device.