Patent ID: 7102444

Claim:
A method for amplifying comprising: operating a first amplifier comprising a first active device supplying a first signal to a first matching network, the first matching network producing a first output, the first matching network including a first set of devices having a first resonance at a normal operating frequency of the circuit; and operating a second amplifier comprising a second active device supplying a second signal to a second matching network, the second matching network producing a second output, the second matching network including a second set of devices having a second resonance at the normal operating frequency of the circuit; wherein the respective outputs of the first and second amplifiers are summed at a summing node to produce a summed signal and, wherein a circuit output signal is derived from tho summed signal and, wherein the method has at least a first operating mode and a second operating mode and, wherein whenever the method is utilizing the second operating mode: the second active device is cut off and at least one of the first and second matching networks is loaded by a compensating impedance circuit; and wherein whenever the method is utilizing the first operating mode: the first and second active devices are biased to be active and turned on and neither of the first and second matching networks is loaded by the compensating impedance circuit, whereby the circuit operates with high efficiency and higher power in the first operating mode and the circuit operates with high efficiency and lower power in the second operating mode.