DOI: 10.1109/TMTT.2024.3426474   IEEEXplore: https://ieeexplore.ieee.org/document/10621674    

Simultaneous transmit and receive (STAR) magnetic-less front-end with quadrature-balanced power amplifier (QB-PA) in GaN technology

1.66 GHz

Harmonic tuning and high output reflection of the high-power GaN PA signal are considered to design a magnetic-less front end with high TX efficiency, high RX linearity and low RX path loss.

Proof of concept in the 4G LTE spectrum.

40 dBm peak TX power; ~80% peak TX efficiency, ~30% average efficiency for transmitting LTE signals; 20 MHz RX bandwidth, 1.6 dB RX insertion loss; 1.6 dB RX NF (w/o TX) 22 dB TX-RX primary isolation; ~3% TX error vector magnitude (EVM), <4% RX EVM (w TX)