DESIGN AND SIMULATION OF MULTIBAND POWER AMPLIFIER

As inferred from the name, the main job of a “Power Amplifier ” (also known as ‘large signal amplifier’), is to deliver power to the load and it is mathematically given by the product of the voltage across the load and current flowing through the load, with the output signal power being greater than the input signal power. In other words, a power amplifier amplifies the power of the input signal which is why these types of amplifier circuits are used in audio amplifier output stages to drive loudspeakers. For successful mobile phone communication, the job of the power amplifier is to boost the small digitally modulated input signal to an adequate output power level before it is radiated by the antenna. It is the most power consuming device in the whole transmitter chain, and hence, the performance of complete system, is mainly dependent on the performance of the power amplifier. The main concerns of power amplifier design are higher linearity, efficiency, bandwidth, lower manufacturing cost, and so on