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Highly compact GaN-based all-digital transmitter chain including SPDT T/Rx switch for massive MIMO applications

  • Florian Hühn (a1), Andreas Wentzel (a1) and Wolfgang Heinrich (a1)

Abstract

This paper presents a fully digital transmitter chain from baseband to antenna, including a modulator, two truly digital (i.e. fully switched) microwave power amplifiers and a transmit/receive switch. Both, amplifier and switch monolithic microwave integrated circuits were implemented in a GaN HEMT process. The novel amplifier design provides greatly reduced complexity, needing only three voltage sources. Measurements were conducted using 5, 20, and 100 MHz wide baseband signals. Carrier frequencies cover the 900 and 2000 MHz bands. For the 5 MHz BB signal an ACLR of over 52 dB is reached, fulfilling the 3GPP specs for base station use while still maintaining a final-stage drain efficiency of 46% at 6.5 dB peak to average power ratio. Full-scale output power at 30 V supply voltage was measured to exceed 3 W at 80% drain efficiency. Further features of this digital amplifier approach include small form factor and frequency agility, making it an ideal candidate for software defined radio.

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Corresponding author

Author for correspondence: Florian Hühn, E-mail: florian.huehn@fbh-berlin.de

References

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1Dinis, DC, Oliveira, ASR and Vieira, J (2017) All-digital transmitter based on cascaded delta-sigma modulators for relaxing the analog filtering requirements. 2017 IEEE MTT-S International Microwave Symposium Dig., 145148.
2Tanio, M, Hori, S, Tawa, N and Kunihiro, K (2017) An FPGA-based all-digital transmitter with 9.6-GHz 2nd order time-interleaved delta-sigma modulation for 500-MHz bandwidth. 2017 IEEE MTT-S International Microwave Symposium Dig., 149152.
3Wentzel, A, Chevtchenko, S, Kurpas, P and Heinrich, W (2015) A flexible GaN MMIC enabling digital power amplifiers for the future wireless infrastructure. 2015 IEEE MTT-S International Microwave Symposium Dig., paper TH2B-5.
4Soma, T, Hori, S, Wentzel, A, Heinrich, W and Kunihiro, K (2017) A 2-W GaN-based three-level class-D power amplifier with tunable back-off efficiency. 2017 IEEE MTT-S International Microwave Symposium Dig., 20332036.
5Hoffmann, T, Wentzel, A, Hühn, F and Heinrich, W (2017) Novel digital microwave PA with more than 40% PAE over 10 dB power back-off range. 2017 IEEE MTT-S International Microwave Symposium Dig., 20372040.
6Hühn, F, Wentzel, A and Heinrich, W (2018) Highly compact GaN-based all-digital transmitter chain including SPDT switch for massive MIMO. 2018 48th European Microwave Conference proc., 918921.
7Hühn, F, Wentzel, A and Heinrich, W (2017) GaN-Based digital transmitter chain utilizing push-pull gate drivers for high switching speed and built-in DPD. 2017 12th European Microwave Integrated Circuits Conference proc., 97100.
8Hühn, F, Wentzel, A and Heinrich, W (2017) A new modulator for digital RF power amplifiers utilizing a wavetable Approach. International Journal of Microwave and Wireless Technologies 9, 12511260.
9Tanio, M, Hori, S, Hayakawa, M, Tawa, N, Motoi, K and Kunihiro, K (2014) A linear and efficient 1-bit digital transmitter with envelope delta-sigma modulation for 700MHz LTE. 2014 IEEE MTT-S International Microwave Symposium Dig., paper TU4F-2.

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