Miller compensation using current buffers in fully differential CMOS two-stage operational amplifiers |
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Authors: | Hurst P.J. Lewis S.H. Keane J.P. Aram F. Dyer K.C. |
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Affiliation: | Dept. of Electr. & Comput. Eng., Univ. of California, Davis, CA, USA; |
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Abstract: | Several Miller compensation schemes using a current buffer in series with the compensation capacitor to modify the right-half-plane zero in fully differential two-stage CMOS operational amplifiers are analyzed. One scheme uses a current mirror as a current buffer, while the rest use a common-gate transistor as a current buffer. The gain transfer functions are derived for each topology, and approximate transfer-function coefficients are found that allow accurate estimation of the zero(s) and poles. |
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