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A Two-Stage Fully Differential Inverter-Based Self-Biased CMOS Amplifier With High Efficiency

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6 Author(s)
Figueiredo, M. ; Dept. of Electr. Eng., Univ. Nova de Lisboa, Caparica, Portugal ; Santos-Tavares, R. ; Santin, E. ; Ferreira, J.
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A two-stage fully differential CMOS amplifier comprising inverters as input structures and employing self-biasing techniques is presented. The proposed amplifier benefits from an optimum compensation through time-domain optimization which permits achieving high energy efficiency. Moreover, it achieves the highest efficiency of its class and although it relies on a quasi-class-A topology, it is comparable to class-AB amplifiers. Detailed circuit analyses such as differential-mode, common-mode feedback, noise, slew rate, and input/output range are carried out. Based on these analyses, a manual design methodology and a genetic algorithm based optimization are presented. Finally, the most relevant experimental results for an integrated circuit prototype designed in a 0.13 μm 1.2 V standard CMOS technology are shown.

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Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:58 ,  Issue: 7 )