RF RF POWER AMPLIFIERS WITH IMPROVED EFFICIENCY AND OUTPUT POWER

摘要

Amplifiers with improved efficiency and output power are described. In an exemplary design, the apparatus includes an amplifier having at least three transistors and at least two capacitors. At least three transistors are coupled in a stack and receive and amplify the input signal and provide an output signal. At least two capacitors are coupled to at least one capacitor coupled between the drain and source of the associated transistor for each of the at least two transistors in the stack, at least one capacitor for each transistor in the stack, Lt; / RTI At least two capacitors recycle the energy from the gate-source parasitic capacitors of the at least two transistors into an output signal, which improves the efficiency and output power of the amplifier.