60% high-efficiency 3G LTE power amplifier with three-level delta sigma modulation assisted by dual supply injection

Summary form only given, as follows. This paper presents a new power amplifier architecture incorporating a multi-level envelope delta-sigma modulation encoder together with a dynamic bias control method to improve the overall efficiency. The proposed transmitter was developed based on a 3-level encoding process for quantizing the non-constant envelope signal. Therefore, the power amplifier is always operated under only a two-state output power level, achieving high efficiency.