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A Multimode 28 GHz CMOS Fully Differential Beamforming IC for Phased Array Transceivers.

Ayush Bhatta1, Jeongsoo Park2, Donghyun Baek3

  • 1Department of Electronic Engineering, Kwangwoon University, Seoul 01897, Republic of Korea.

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Summary
This summary is machine-generated.

This study presents an eight-channel beamforming integrated circuit (BFIC) for 28 GHz phased array transceivers. The BFIC offers precise gain and phase control for advanced beam steering applications.

Keywords:
28 GHzCMOSbeamformingfifth generation (5G)mm wavemulti-channelmultimodephase and gain controlphased array antennatransceiver

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Area of Science:

  • Electrical Engineering
  • Microwave Engineering
  • Integrated Circuit Design

Background:

  • Phased array transceivers require advanced beamforming integrated circuits (BFICs) for precise signal directionality.
  • The 28 GHz frequency band is crucial for emerging high-speed wireless communication systems.

Purpose of the Study:

  • To implement and characterize a fully differential eight-channel beamforming IC (BFIC) for 28 GHz phased array transceivers.
  • To achieve fine beam steering and beam pattern control through adjustable gain and phase settings.

Main Methods:

  • Implementation of an eight-channel, fully differential BFIC in 65 nm CMOS technology.
  • Integration of two-stage bidirectional amplifiers, six-bit phase shifters, and three-bit digital step attenuators per channel.
  • Inclusion of tuning bits for amplitude and phase variation compensation.

Main Results:

  • Achieved overall gains of approximately 11 dB (Tx) and 9 dB (Rx) between 27.0-29.5 GHz.
  • Demonstrated return losses >10 dB in both Tx and Rx modes within the 27.0-29.5 GHz range.
  • Attained a maximum phase shift of 354° with 5.6° resolution and 31 dB attenuation with 1 dB resolution, exhibiting RMS phase and amplitude errors below 3.2° and 0.6 dB, respectively.

Conclusions:

  • The developed 28 GHz BFIC enables precise beam steering and pattern control for phased array systems.
  • The circuit's performance metrics, including gain, return loss, phase/amplitude control, and low errors, are suitable for advanced transceiver applications.
  • The compact chip size (3.0 × 3.5 mm²) and multimode operation enhance its applicability in modern wireless communication.