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Small-Signal Analysis of a Differential Two-Stage Folded-Cascode CMOS Op Amp 원문보기

Journal of semiconductor technology and science, v.14 no.6, 2014년, pp.768 - 776  

Yu, Sang Dae (School of Electronics Engineering, Kyungpook National University)

Abstract ▼ AI-Helper 아이콘AI-Helper

Using a simplified high-frequency small-signal equivalent circuit model for BSIM3 MOSFET, the fully differential two-stage folded-cascode CMOS operational amplifier is analyzed to obtain its small-signal voltage transfer function. As a result, the expressions for dc gain, five zero frequencies, five...

주제어

#Differential two-stage folded-cascode CMOS op amp   #equation-based circuit design   #high speed   #low power   #pole and zero frequency   #small-signal transfer function   #frequency response   #BSIM3  

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제안 방법

  • Using a high-frequency small-signal equivalent circuit with the complex transconductance, the fully differential two-stage folded-cascode CMOS operational amplifier was analyzed to obtain its small signal transfer function. As a result, the expressions for dc gain, five zero frequencies, five pole frequencies, unity-gain frequency, and phase margin were derived for op amp design using design equations. From comparing with Spice analysis, the good agreement between the transfer function model and simulation result has been observed for two op amps operating in either moderate or strong inversion.
  • But in spite of the fact that the differential two-stage folded-cascode CMOS op amp is used in various analog circuits, its small signal design equations have not yet been derived analytically. In this paper, the transfer function of such an op amp will be analyzed to obtain its small-signal design equations. Then the analysis result will be verified through the comparison with Spice simulations of both a designed high speed CMOS op amp with a unity-gain frequency of 576 MHz and a designed very low power CMOS op amp with a quiescent power dissipation of 2.
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참고문헌 (19)

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  15. A. S. Sedra and K. C. Smith, Microelectronic Circuits. Oxford University Press, 2011. 

  16. S. M. Mallya and J. H. Nevin, "Design procedures for a fully differential folded-cascode CMOS operational amplifier," IEEE J. Solid-State Circuits, vol. 24, pp. 1737-1740, Dec. 1989. 

    상세보기 crossref

  17. P. E. Gray and C. L. Searle, Electronic Principles. John Wiley & Sons, 1969. 

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  19. R. J. Duffin, E. L. Peterson, and C. Zener, Geometric Programming-Theory and Application. New York: Wiley, 1967. 

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