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High PSRR Low-Dropout(LDO) Regulator

높은 PSRR을 갖는 Low-Dropout(LDO) 레귤레이터

  • Kim, In-Hye (Dept. of Electronics and Communication engineering, Hanyang University) ;
  • Roh, Jeong-Jin (Dept. of Electronics and Communication engineering, Hanyang University)
  • Received : 2016.09.20
  • Accepted : 2016.09.29
  • Published : 2016.09.30

Abstract

As IoT industry are growing fast, The importance of power management system is also being magnified. CMOS High power-supply rejection ratio(PSRR) Low-dropout(LDO) regulator is achieved by the proposed ripple Subtractor, Feed-forward capacitor and OTA in this paper. The LDO is implemented in $0.18-{\mu}m$ CMOS technology. With the proposed structures, in the maximum loading of 40mA, Simulation result achieves PSRR of -73.4dB at 500kHz and PSRR better than -40dB when frequency is below 10MHz with $6.8-{\mu}F$ output capacitor.

IoT 산업이 빠르게 성장하면서 전원 관리 집적회로의 중요성이 부각되고 있다. 본 논문에서는 리플 Subtractor, 피드 포워드 커패시터, OTA를 이용한 LDO 구조를 제안한다. 이를 통해 10MHz가 넘는 고주파 영역에서도 -40dB 이상 높은 전원 전압 제거비(PSRR)를 얻었다. 설계된 Low-Dropout(LDO) 레귤레이터는 $0.18{\mu}m$ CMOS 공정에서 설계되었으며 시뮬레이션 결과 PSRR은 부하 전류 40mA, 500kHz에서 -73.4dB다. 최대 구동 가능 전류는 40mA이다.

Keywords

References

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