한국ITS학회 논문지 (The Journal of The Korea Institute of Intelligent Transport Systems)

  • 제11권4호
  • /
  • Pages.70-79
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  • 2012
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  • 1738-0774(pISSN)
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  • 2384-1729(eISSN)
한국ITS학회 (The Korea Institute of Intelligent Transport Systems)
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FMCW 레이더용 타입-3 PLL의 설계 가이드

A Design Guide to Type-3 PLLs for FMCW Radars

  • 황인덕 (대전대학교 IT전자공학과) ;
  • 김창환 (대전대학교 IT전자공학과)
  • 투고 : 2012.06.07
  • 심사 : 2012.08.14
  • 발행 : 2012.08.28
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초록

FMCW 레이더에서 주파수 램프 신호를 발생시키기 위하여 필요한 타입-3 PLL의 설계 가이드를 제시하였다. 그러기 위해서 개루프 전달함수의 크로스오버 주파수를 1 Hz로 정규화 한 조건에서 Pspice 시뮬레이션을 통하여 폐루프 특성을 비교하였다. 결론적으로 타입-3 PLL의 1) 위상여유는 45도로 하고, 2) 두 개의 영점은 같도록 하며, 3) PLL 차수를 높이기 위한 극점은 개루프 전달함수의 크로스오버 주파수보다 10배 정도 크게 할 것을 권한다.

A design guide to type-3 PLLs for FMCW radars is provided. To do that, the cross-over frequencies of the open-loop transfer functions were normalized to 1 Hz and closed-loop properties were compared through simulations using Pspice. As a result, several guides to design type-3 PLLs were provided: 1) secure 45 degrees of phase margin, 2) locate two zeroes at an identical frequency, and 3) poles may be added to raise order of the PLL at higher frequencies than the cross-over frequency of the open-loop transfer function about ten times.

키워드

참고문헌

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