Patent ID: 7944291

Claim:
A device, comprising: an input terminal; an output terminal; a driver amplifier having an input terminal, and an output terminal, where the input terminal is connected to the input terminal; a first main amplifier having an input terminal and an output terminal, and configured to receive a first activation signal for selectively activating and deactivating the first amplifier; a second main amplifier having an input terminal and an output terminal, and configured to receive a second activation signal for selectively activating and deactivating the second amplifier; a control circuit configured to supply the first and second activation signals to the first and second amplifiers, respectively; a first impedance matching circuit directly connected between the output terminal of the driver amplifier and a first intermediate node; a second impedance matching circuit directly connected between the first intermediate node and a second intermediate node; a third impedance matching circuit directly connected between the second intermediate node and the input terminal of the first main amplifier; a fourth impedance matching circuit directly connected between the second intermediate node and the input terminal of the second main amplifier; a fifth impedance matching circuit directly connected between the output terminal of the first main amplifier and a third intermediate node; a sixth impedance matching circuit directly connected between the output terminal of the second main amplifier and the third intermediate node; an impedance transformation network directly connected between the first intermediate node and the third intermediate node; and a seventh impedance matching circuit directly connected between the third intermediate node and the output terminal.