On the power efficiency of cascode compensation over Miller compensation in two-stage operational amplifiers

Authors:
Hamed Aminzadeh;Khalil Mafinezhad
Affiliations:
Ferdowsi University of Mashhad, Mashhad, Iran;Ferdowsi University of Mashhad, Mashhhad, Iran
Venue:
Proceedings of the 13th international symposium on Low power electronics and design
Year:
2008

Citing 3
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Analysis and Design of Analog Integrated Circuits

Analysis and Design of Analog Integrated Circuits
Design of high-speed two-stage cascode-compensated operational amplifiers based on settling time and open-loop parameters

Integration, the VLSI Journal
Design of Analog CMOS Integrated Circuits

Design of Analog CMOS Integrated Circuits

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Abstract

Optimization of power consumption is one of the main design challenges in today's low-power high-speed analog integrated circuits. In this paper, two popular techniques to stabilize two-stage operational amplifiers, namely Miller and cascode compensations are compared from power point of view. To accomplish this, the cascode-compensated structure is basically analyzed to derive the required equations for comparison. The results show that for the same specifications, cascode compensation is more power efficient than Miller compensation especially for heavy capacitive loads. This has been confirmed by circuit-level simulations in 0.25μm CMOS technology.