Patent ID: 8045939

Claim:
A method for controlling an amplifier unit, wherein said amplifier unit comprises at least one drive signal input connection, at least one power supply voltage input connection and an output connection, and wherein said amplifier unit comprises at least one amplifier, the method comprising the steps of: feeding each amplifier by a drive signal from said at least one drive signal input connection; feeding each amplifier by a power supply voltage from said at least one power supply voltage input connection; wherein said amplifier unit has defined output characteristics at the output connection and a predetermined power supply voltage at a maximum RF output power for an RF signal; operating at least one amplifier with RF output voltage characteristics to obtain a reduced shunt loss, compared to a reference shunt loss, at the output connection, wherein said reference shunt loss is obtained when operating each amplifier as a class B amplifier having the defined output characteristics at the output connection and the predetermined power supply voltage at a maximum RF output power for the RF signal; and, modulating the power supply voltage to each amplifier to reduce excessive voltage drop over the amplifier.