Yen HTsai JBai WHung JLiang Y.TIAN-WEI HUANG2022-04-252022-04-25202115311309https://www.scopus.com/inward/record.uri?eid=2-s2.0-85120089696&doi=10.1109%2fLMWC.2021.3125960&partnerID=40&md5=1055fcd0f4921024ae8ef35387fb4c5bhttps://scholars.lib.ntu.edu.tw/handle/123456789/607321This letter presents an ultrabroadband power amplifier (PA) with AM-phase modulation (PM) linearizer in a 28-nm bulk CMOS process for 5G millimeter-wave (mm-Wave) mobile communications. To enable the 5G mm-Wave multigigahertz broadband, a pMOS linearizer in power stage is introduced to achieve broadband AM-PM linearization. The proposed linearized PA achieves a 3-dB gain bandwidth (BW) from 19.7 to 38.9 GHz (65.5%) covering multiple 5G bands. The measured OP <formula> <tex>$_{{1,dB}}$</tex> </formula> is 12.7 dB ± 0.6 dB from 22 to 38 GHz, and the PAE is larger than 25% from 21 to 36 GHz (50%). For 100-MHz 64-quadratic-amplitude modulation (QAM) orthogonal frequency-division multiplexing (OFDM) signal, this PA obtains a linear output power of 8.5 dBm/8.3 dBm/8.8 dBm under error vector magnitude (EVM) of -25 dB with modulated PAE of 11.0%/11.0%/11.9% at 23 GHz/28 GHz/38 GHz, respectively. Moreover, the measured back-off power from OP <formula> <tex>$_{{1,dB}}$</tex> </formula> to linear output power is 4.7 dB/3.9 dB/3.7 dB at 23 GHz/28 GHz/38 GHz. IEEE5G mobile5G mobile communicationbroadbandBroadband communicationCMOSLinearitylinearizermillimeter-wave (mm-Wave)OFDMpower amplifier (PA).Power generationTransformersWideband5G mobile communication systemsAmplitude modulationBroadband amplifiersCMOS integrated circuitsLinearizationMillimeter wavesOrthogonal frequency division multiplexingBroadbandBroadband CommunicationLinearizersMillimeter-waveOrthogonal frequency-division multiplexingPower amplifier .Power- generationsTransformerWide-bandPower amplifiers[SDGs]SDG7journal article10.1109/LMWC.2021.31259602-s2.0-85120089696