SEMICONDUCTOR INTEGRATED CIRCUITS

A controllable resistor and its applications in pole–zero tracking frequency compensation methods for LDOs

Wang Yi, He Lenian, Ning Zhihua and Shao Yali

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Abstract: This paper presents a controllable resistor, which is formed by a MOS-resistor working in the deep triangle region and an auxiliary circuit. The auxiliary circuit can generate the gate–source voltage which is proportional to the output current of an low dropout regulator for the MOS-resistor. Thus, the equivalent output resistance of the MOS-resistor is inversely proportional to the output current, which is a suitable feature for pole-zero tracking frequency compensation methods. By switching the type of the MOS-resistor and current direction through the auxiliary circuit, the controllable resistor can be suitable for different applications. Three pole-zero tracking frequency compensation methods based on a single Miller capacitor with nulling resistor, unit-gain compensation cell and pseudo-ESR (equivalent serial resistor of load capacitor) power stage have been realized by this controllable resistor. Their advantages and limitations are discussed and verified by simulation results.

Key words: controllable resistor

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    Received: 18 August 2015 Revised: 30 April 2009 Online: Published: 01 September 2009

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      Wang Yi, He Lenian, Ning Zhihua, Shao Yali. A controllable resistor and its applications in pole–zero tracking frequency compensation methods for LDOs[J]. Journal of Semiconductors, 2009, 30(9): 095013. doi: 10.1088/1674-4926/30/9/095013 Wang Y, He L N, Ning Z H, Shao Y L. A controllable resistor and its applications in pole–zero tracking frequency compensation methods for LDOs[J]. J. Semicond., 2009, 30(9): 095013. doi: 10.1088/1674-4926/30/9/095013.Export: BibTex EndNote
      Citation:
      Wang Yi, He Lenian, Ning Zhihua, Shao Yali. A controllable resistor and its applications in pole–zero tracking frequency compensation methods for LDOs[J]. Journal of Semiconductors, 2009, 30(9): 095013. doi: 10.1088/1674-4926/30/9/095013

      Wang Y, He L N, Ning Z H, Shao Y L. A controllable resistor and its applications in pole–zero tracking frequency compensation methods for LDOs[J]. J. Semicond., 2009, 30(9): 095013. doi: 10.1088/1674-4926/30/9/095013.
      Export: BibTex EndNote

      A controllable resistor and its applications in pole–zero tracking frequency compensation methods for LDOs

      doi: 10.1088/1674-4926/30/9/095013
      • Received Date: 2015-08-18
      • Accepted Date: 2009-02-09
      • Revised Date: 2009-04-30
      • Published Date: 2009-08-28

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