Journal of IKEEE (전기전자학회논문지)

Institute of Korean Electrical and Electronics Engineers (한국전기전자학회)
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26GHz 40nm CMOS Wideband Variable Gain Amplifier Design for Automotive Radar

차량용 레이더를 위한 26GHz 40nm CMOS 광대역 가변 이득 증폭기 설계

  • Choi, Han-Woong (Dept. of Electronics Engineering, Chungnam National University) ;
  • Choi, Sun-Kyu (Dept. of Electronics Engineering, Chungnam National University) ;
  • Lee, Eun-Gyu (Dept. of Electronics Engineering, Chungnam National University) ;
  • Lee, Jae-Eun (Dept. of Electronics Engineering, Chungnam National University) ;
  • Lim, Jeong-Taek (Dept. of Electronics Engineering, Chungnam National University) ;
  • Lee, Kyeong-Kyeok (Dept. of Electronics Engineering, Chungnam National University) ;
  • Song, Jae-Hyeok (Dept. of Electronics Engineering, Chungnam National University) ;
  • Kim, Sang-Hyo (Dept. of Electronics Engineering, Chungnam National University) ;
  • Kim, Choul-Young (Dept. of Electronics Engineering, Chungnam National University)
  • Received : 2018.06.12
  • Accepted : 2018.06.25
  • Published : 2018.06.30
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Abstract

In this paper, a 26GHz variable gain amplifier fabricated using a 40nm CMOS process is studied. In the case of an automobile radar using 79 GHz, it is advantageous in designing and driving to drive down to a low frequency band or to use a low frequency band before up conversion rather than designing and matching the entire circuit to 79 GHz in terms of frequency characteristics. In the case of a Phased Array System that uses time delay through TTD (True Time Delay) in practice, down conversion to a lower frequency is advantageous in realizing a real time delay and reducing errors. For a VGA (Variable Gain Amplifier) operating in the 26GHz frequency band that is 1/3 of the frequency of 79GHz, VDD : 1V, Bias 0.95V, S11 is designed to be <-9.8dB (Mea. High gain mode) and S22 < (Mea. high gain mode), Gain: 2.69dB (Mea. high gain mode), and P1dB: -15 dBm (Mea. high gain mode). In low gain mode, S11 is <-3.3dB (Mea. Low gain mode), S22 <-8.6dB (Mea. low gain mode), Gain: 0dB (Mea. low gain mode), P1dB: -21dBm (Mea. Low gain mode).

이 논문에서는 40nm CMOS 공정을 이용하여 제작된 26GHz 가변 이득 증폭기에 대한 연구를 수행하였다. 79GHz를 사용하는 자동차 레이더의 경우 주파수 특성상 회로 전체를 79GHz로 설계 및 매칭 하기 보다는 Down conversion 하여 낮은 주파수대역으로 구동하거나 Up conversion 전에 낮은 주파수 대역을 이용하는 것이 설계 및 구동에 유리하다. 실제적으로 TTD(True Time Delay)를 통해 시간지연을 이용하는 Phased Array System 의 경우에도 현재 기술로는 낮은 주파수로 Down conversion하는 것이 오차를 줄이고 실제적 시간지연을 구현하는데 좋다. 79GHz 주파수의 1/3인 26GHz 주파수 대역에서 동작하는 VGA(Variable Gain Amplifier)에 대하여 설계하였고 1-stage의 cascode amplifier 형태로 구성된 회로에서 VDD : 1V, Bias 0.95V, S11은 < -9.8dB(Mea. High gain mode), S22 <-3.6dB(Mea. High gain mode), Gain : 2.69dB(Mea. High gain mode), P1dB : -15 dBm (Mea. High gain mode) 로 설계되었다. Low gain mode 에서는 S11은 < -3.3dB(Mea. Low gain mode), S22 < -8.6dB(Mea. Low gain mode), Gain : 0dB(Mea. Low gain mode), P1dB : -21 dBm (Mea. Low gain mode)로 설계되었다.

Keywords

References

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