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X-Band 6-Bit Phase Shifter with Low RMS Phase and Amplitude Errors in 0.13-㎛ CMOS Technology

  • Han, Jang-Hoon (Department of Electronic Engineering, Kwangwoon University) ;
  • Kim, Jeong-Geun (Department of Electronic Engineering, Kwangwoon University) ;
  • Baek, Donghyun (School of Electrical Engineering, Chung-Ang University)
  • Received : 2015.12.22
  • Accepted : 2016.04.10
  • Published : 2016.08.30

Abstract

This paper proposes a CMOS 6-bit phase shifter with low RMS phase and amplitude errors for an X-band phased array antenna. The phase shifter combines a switched-path topology for coarse phase states and a switch-filter topology for fine phase states. The coarse phase shifter is composed of phase shifting elements, single-pole double-throw (SPDT), and double-pole double-throw (DPDT) switches. The fine phase shifter uses a switched LC filter. The phase coverage is $354.35^{\circ}$ with an LSB of $5.625^{\circ}$. The RMS phase error is < $6^{\circ}$ and the RMS amplitude error is < 0.45 dB at 8-12 GHz. The measured insertion loss is < 15 dB, and the return losses for input and output are > 13 dB at 8-12 GHz. The input P1dB of the phase shifter achieves > 11 dBm at 8-12 GHz. The current consumption is zero with a 1.2-V supply voltage. The chip size is $1.46{\times}0.83mm^2$, including pads.

Keywords

References

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