Miller compensation using current buffers in fully differential CMOS two-stage operational amplifiers

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 tr...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. 1, Fundamental theory and applications Fundamental theory and applications, 2004-02, Vol.51 (2), p.275-285
Main Authors: Hurst, P.J., Lewis, S.H., Keane, J.P., Aram, F., Dyer, K.C.
Format: Article
Language:English
Subjects:
Approximation
Buffers
Capacitors
Circuits
CMOS
Compensation
Current mirrors
Differential amplifiers
Frequency
Gain
Impedance
Mirrors
Operational amplifiers
Poles and zeros
Transfer functions
Voltage
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Summary: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.
ISSN:1549-8328
1057-7122
1558-0806
DOI:10.1109/TCSI.2003.820254