Abstract
This letter presents a millimeter-wave power amplifier (PA) monolithic microwave integrated circuit (MMIC) for 5G new radio (NR) phased array base stations. The balanced/unbalanced-mode broadband power combining is used in the proposed PA to obtain higher linearity and efficiency at the 5G-n257/n258/n261 bands. Fabricated in a 0.15- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu$</tex-math> </inline-formula> m GaAs pHEMT process, the PA delivers 22-dBm saturated output power ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$P_{\mathrm{OUT}})$</tex-math> </inline-formula> with maximum power-added efficiency (PAE) of 36.5% under a 3-V supply at 23–30 GHz. With the 5G NR FR2 200-MHz 1-CC 64-QAM modulated signal, the PA achieves an average <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$P_{\mathrm{OUT}}$</tex-math> </inline-formula> of 13.5/12.5 dBm and PAE of 7.5%/7.6% with rms error vector magnitude (EVM) of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$-$</tex-math> </inline-formula> 28/ <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$-$</tex-math> </inline-formula> 25 dB in balanced/unbalanced mode.
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