Electronic Science and Technology ›› 2019, Vol. 32 ›› Issue (2): 61-65.doi: 10.16180/j.cnki.issn1007-7820.2019.02.013

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Design of LDO Circuit Based on DynamicFrequency Compensation

NIU Ganggang1,LI Wei1,LIU Wentao2,ZHAI Yahong1   

  1. 1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054,China
    2. The 24th Institute of China Electronics Technology Group Corporation,Chongqing 400060, China
  • Received:2018-01-15 Online:2019-02-15 Published:2019-01-02
  • Supported by:
    Opening Project Technology on Reliability Physics and Application Technology of Electronic Component Laboratory(ZHD201601)


This paper presented a LDO circuit based on dynamic frequency compensation. The LDO loop gain and transient-response characteristics were improved by adding a voltage buffer. The circuit used a current mirror to sample the current of pass transistor, making the frequency of the main pole and the third pole present the same change with the load current. With this method, the problem of loop stability caused by LDO’s zeros and poles changing with load current was overcome. Based on CETC 24 th Institute’s HC12 BJT technology and simulation conducted by Spectre, the LDO’s frequency characteristic under different load current was studied. The simulation results demonstrated that the LDO loop had a phase margin of 50° to 70° when load current varied from 10 μA to 100 mA, proving the good stability of the proposed LDO regulator.

Key words: dynamic frequency compensation, current mirror, zeros and poles, loop compensation, phase margin, stability

CLC Number: 

  • TN431