A 2.4 GHz SiGe Envelope Tracking Power Amplifier for LTE Applications

This paper presents a 2.4 GHz SiGe Power Amplifier based on envelope tracking (ET) technology for long term evolution (LTE) application, aiming to improve efficiency. The ET consists of envelope detector and envelope modulator. Using linear amplifier assisted switching amplifier to improve the system bandwidth, the proposed technique enhances the PA’s back-off efficiency. The power amplifier is designed in 0.18um SiGe process and simulated with LTE16QAM signal. The simulated peak output power is 30.1 dBm at 2.4 GHz with 42% peak power added efficiency (PAE) and average output power is 24.6 dBm with 24% average PAE.