A 26GHz Balun-First Three-Way Doherty PA in 40nm CMOS with 20.7 dBm Psat and 20dB Power Gain
Anil Kumar Kumaran (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Masoud Pashaeifar (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Hossein Mashad Nemati (Huawei Technologies)
Leo C.N. De Vreede (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Morteza S. Alavi (TU Delft - Electrical Engineering, Mathematics and Computer Science)
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Abstract
This paper presents a 40nm CMOS mm-wave 3-way Doherty power amplifier (PA) suitable for 5G mm-wave transmitters. It features a bandwidth-enhanced technique using a compact single-supply balun-first 3-way Doherty combiner. The realized front-end with a core area of 0.77 mm2delivers a peak power/gain of more than 20 dBm/16 dB and a drain efficiency (DE) of better than 15 %/22 %/33 % at 9.5 dB/6 dB/0 dB power back-off across a 24-to-30 GHz band. At 26 GHz, it achieves an EVM/ACLR of -23.5 dB/-29.5 dBc for an 800MHz 64-OFDM signal with 9.8 dBm average output power and a 15 % average DE.