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Open AccessArticle

A CMOS Transmitter Analog Baseband for 5G Mobile Communication

Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
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Electronics 2019, 8(11), 1319; https://doi.org/10.3390/electronics8111319
Received: 1 October 2019 / Revised: 28 October 2019 / Accepted: 1 November 2019 / Published: 8 November 2019
(This article belongs to the Section Microwave and Wireless Communications)
CMOS analog baseband circuits including a low-pass filter (LPF) and a programmable gain amplifier (PGA) are designed and implemented for the fifth-generation (5G) mobile communication. The super source follower topology is adopted to achieve a wideband LPF with good linearity, while the constant current density gain control technique is used to implement gain cells of the PGA. The circuits are integrated as an analog baseband for a 5G transmitter (TX) and fabricated using TSMC 90-nm CMOS technology. The analog baseband exhibits the bandwidth from 1.03 to 1.05 GHz when the voltage gain is varied from −18.9 dB to 3.8 dB in 1-dB steps. The gain step errors are within −0.7 dB to 0.9 dB. In the highest gain mode, the analog baseband achieves the IP1dB of −10 dBv and the IIP3 of −0.2 dBv. Over the band of interest, the NF of the analog baseband is 24.4–40.0 dB.
Keywords: 5G mobile communication; analog baseband; low-pass filter (LPF), programmable gain amplifier (PGA), super source follower; transmitter 5G mobile communication; analog baseband; low-pass filter (LPF), programmable gain amplifier (PGA), super source follower; transmitter
MDPI and ACS Style

Yen, M.-Y.; Chen, H.-C.; Wei, Y.-L.; Chung, C.-Y. A CMOS Transmitter Analog Baseband for 5G Mobile Communication. Electronics 2019, 8, 1319.

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