A low-area, 43.5% PAE, 0.9Â W, Class-E differential power amplifier in 2.4Â GHz for IoT applications

In this study, a new Class-E power amplifier (CEPA) with high efficiency, gain and output power for the Internet of things (IoT) applications is presented. Using cross coupling neutralization and fully differential topology in Class-E power amplifier, led to high-power efficiency, high-power gain and better reverses isolation. Cross coupled pair structure and the tuning LC tank oscillator are employed to decrease THD and power consumption. On the other hand, cross coupled capacitor could improve the performance of our design; and differential topology could cause high power efficiency, while cross coupled neutralization could increase PAE and power gain. The main contribution of this structure is employing cross capacitor intelligently. In this way, the capacitor used is not only contributing in stability enhancement, but also in die size diminishing. The performance and frequency range of the presented PA has appropriated it for IoT applications. The proposed Class-E amplifier can attain 29.5 dbm output power at 2.4 GHz with 43.5% and 36 dB of PAE and power gain, respectively. Furthermore, the proposed power amplifier can deliver 0.9 W to load. These results are verified by post layout simulations of the proposed PA performed by 0.18 µm standard CMOS technology.