A CMOS PA for Bluetooth
Kluwer Academic Publishers eBooks · 2005
A 1.9GHz–2.1GHz class AB power amplifier has been presented with PAE of 33%. The fabricated power amplifier delivers a maximum output power of 16.6dBm to a 50-Ohm load. The output power can be controlled easily by employing a number of parallel semi-cascode branches. By utilizing more accurate transistor models, the same concept can be extended to higher frequency applications such as Bluetooth radios, which use a controllable 20dBm transmitter. Operating at class AB, the power amplifier is relatively linear, and simple Linearization means can be employed to make it suitable for non-constant envelope modulation standards.