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A Ka-Band CMOS Transmit/Receive Amplifier with Embedded Switch for Time-Division Duplex Applications.

Peng Gu1, Jiajun Zhang1, Dixian Zhao1

  • 1National Mobile Communications Research Laboratory, School of Information Science and Engineering, Southeast University, Nanjing 210096, China.

Micromachines
|December 31, 2025
PubMed
Summary

This study introduces a compact Ka-band transmit/receive (T/R) amplifier with an integrated switch for millimeter-wave 5G and radar. The novel design optimizes size and performance for time-division duplex (TDD) systems.

Keywords:
CMOSlow-noise amplifiermillimeter-wave 5Gpower amplifiertransmit/ receive switch

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Area of Science:

  • Electrical Engineering
  • Microwave Engineering
  • Integrated Circuit Design

Background:

  • Time-division duplex (TDD) transceivers are crucial for millimeter-wave 5G, radar, and imaging.
  • Optimizing passive loss and chip size in TDD transceivers requires co-design of switches and amplifiers.
  • Existing solutions may face challenges in size and integration for high-frequency applications.

Purpose of the Study:

  • To present a novel Ka-band T/R amplifier with an embedded switch topology.
  • To demonstrate a compact and efficient solution for TDD applications.
  • To optimize the integration of switching and amplification functions.

Main Methods:

  • Developed a Ka-band T/R amplifier using a compact two-winding transformer for integrated switching and matching.
  • Implemented the design in 40 nm CMOS technology.
  • Utilized a shared matching network between TX and RX amplification cores.

Main Results:

  • Achieved a peak gain of 17.2 dB (TX mode) and 17.1 dB (RX mode).
  • Demonstrated a wide -3 dB bandwidth of 22.6-30.2 GHz (TX) and 23.4-31.0 GHz (RX).
  • The core chip area is only 0.163 mm².

Conclusions:

  • The proposed Ka-band T/R amplifier offers a compact size and wideband gain.
  • The embedded switch topology effectively integrates switching and amplification.
  • The design is well-suited for Ka-band TDD communication, radar, and imaging systems.