A 30-GHz Switched-Capacitor Power Amplifier for 5G SoCs

Ali Raza Saleem, Kari Stadius, Marko Kosunen, Lauri Anttila, Mikko Valkama, Jussi Ryynänen

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

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Switched-capacitor power amplifier has gained popularity within the radio frequency integrated circuit community, since it is CMOS compatible offering high integration density and good performance particularly in terms of linearity. In this paper we present a study on the use of switched-capacitor power amplifier at millimeter-wave frequency range. We identify the major design challenges in this paper, and demonstrate the feasibility of switched-capacitor power amplifier with a 30-G Hz design case. Our analysis describes the effects of power amplifier device parasitics and their contribution to dynamic power consumption, revealing that these are a major factor in degradation of switched capacitor power amplifier efficiency at millimeter waves. Two circuits, one for 3 GHz and the other for 30 GHz, were designed and simulated with 28-nm bulk CMOS technology. At 3 GHz, the designed switched capacitor power amplifier structure with 6-bit resolution features maximum output power of 19.4 dBm and efficiency of 59% whereas the output power of 18.6 dBm with 21% efficiency is achieved at 30 GHz. The switched-capacitor power amplifier preserves its good linearity at higher frequencies as well, and our design demonstrates an adjacent channel leackage ratio of -34.4 dB at 30 GHz for a 100-MHz OFDM-modulated signal.
Original languageEnglish
Title of host publication2020 27th IEEE International Conference on Electronics, Circuits and Systems (ICECS)
Number of pages4
ISBN (Electronic)978-1-7281-6044-3
Publication statusPublished - 1 Nov 2020
Publication typeA4 Article in conference proceedings
EventIEEE International Conference on Electronics, Circuits and Systems - Glasgow, United Kingdom
Duration: 23 Nov 202025 Nov 2020


ConferenceIEEE International Conference on Electronics, Circuits and Systems
Country/TerritoryUnited Kingdom


  • Switches
  • Capacitance
  • Power generation
  • Capacitors
  • OFDM
  • Power demand
  • Optimized production technology

Publication forum classification

  • Publication forum level 1


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