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A g m /I D Methodology Based Data-Driven Search Algorithm For the Design of Multi-Stage Multi-Path Feed-Forward-Compensated Amplifiers Targeting High Speed Continuous-Time Σ∆-Modulators

Abstract : This work presents a methodology for sizing transistors of a multi-stage, multi-path capacitor-less feed-forward compensated operational amplifiers employed in advanced CMOS process implementation of continuous-time bandpass Σ∆-modulators. The paper describes the methodology: on system level, dealing with the placement of poles and zeros; and on circuit level, discussing issues related to biasing, frequency response and other important performance metrics of the basic diff-pair. Algorithms are provided to simplify mathematical aspects of the work. The validity and the limitations of the proposed methodology are further discussed from the single-pole system used to model the individual amplification stages of the multi-stage amplifier. The worthiness of the proposed methodology in sizing the transistors of complex amplifier structures such as the capacitor-less multi-stage, multi-path feed-forward-compensated amplifiers is demonstrated using two design examples. A 3 rd-order amplifier with a DC gain of 52.6 dB and that reaches a unity-gain frequency of above 14 GHz while consuming only 5.6 mA from a 1 V supply; and a 4 th-order amplifier with DC gain of 73.5 dB that achieves a 25.7 dB gain at 1 GHz while consuming 4.8 mW are designed in 28nm CMOS FDSOI.
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Submitted on : Thursday, January 30, 2020 - 11:56:05 AM
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Fikre Tsigabu Gebreyohannes, Jacky Porte, Marie-Minerve Louërat, Hassan Aboushady. A g m /I D Methodology Based Data-Driven Search Algorithm For the Design of Multi-Stage Multi-Path Feed-Forward-Compensated Amplifiers Targeting High Speed Continuous-Time Σ∆-Modulators. IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems, IEEE, 2020, pp.1-1. ⟨10.1109/TCAD.2020.2966998⟩. ⟨hal-02460780⟩

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