TY - JOUR UR - http://lib.ugent.be/catalog/pug01:980843 ID - pug01:980843 LA - eng TI - The Nyquist criterion: a useful tool for the robust design of continuous-time ΣΔ modulators PY - 2010 JO - (2010) IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS—II: EXPRESS BRIEFS SN - 1549-7747 PB - 2010 AU - De Vuyst, Bart UGent 002002117887 802000252842 AU - Rombouts, Pieter TW06 801000963286 0000-0002-3731-9731 AU - De Maeyer, Jeroen TW08 001997078133 AU - Gielen, Georges AB - This paper introduces a figure of merit for the robustness of continuous-time sigma-delta modulators. It is based on the Nyquist criterion for the equivalent discrete-time (DT) loop filter. It is shown how continuous-time modulators can be designed by optimizing this figure of merit. This way modulators with increased robustness against variations in the noise-transfer function (NTF) parameters are obtained. This is particularly useful for constrained systems, where the system order exceeds the number of design parameters. This situation occurs for example due to the effect of excess loop delay (ELD) or finite gain bandwidth (GBW) of the opamps. Additionally, it is shown that the optimization is equivalent to the minimization of H_infinity, the maximum out-of-band gain of the NTF. This explains why conventional design strategies that are based on H_infinity, such as Schreier’s approach, provide quite robust modulator designs in the case of unconstrained architectures. ER -Download RIS file
00000nam^a2200301^i^4500 | |||
001 | 980843 | ||
005 | 20161219154106.0 | ||
008 | 100618s2010------------------------eng-- | ||
022 | a 1549-7747 | ||
024 | a 000278814400003 2 wos | ||
024 | a 1854/LU-980843 2 handle | ||
024 | a 10.1109/TCSII.2010.2048368 2 doi | ||
040 | a UGent | ||
245 | a The Nyquist criterion: a useful tool for the robust design of continuous-time ΣΔ modulators | ||
246 | a The Nyquist criterion : a useful tool for the robust design of continuous-time sigma delta modulators | ||
260 | c 2010 | ||
520 | a This paper introduces a figure of merit for the robustness of continuous-time sigma-delta modulators. It is based on the Nyquist criterion for the equivalent discrete-time (DT) loop filter. It is shown how continuous-time modulators can be designed by optimizing this figure of merit. This way modulators with increased robustness against variations in the noise-transfer function (NTF) parameters are obtained. This is particularly useful for constrained systems, where the system order exceeds the number of design parameters. This situation occurs for example due to the effect of excess loop delay (ELD) or finite gain bandwidth (GBW) of the opamps. Additionally, it is shown that the optimization is equivalent to the minimization of H_infinity, the maximum out-of-band gain of the NTF. This explains why conventional design strategies that are based on H_infinity, such as Schreier’s approach, provide quite robust modulator designs in the case of unconstrained architectures. | ||
598 | a A1 | ||
100 | a De Vuyst, Bart u UGent 0 002002117887 0 802000252842 0 973452463507 | ||
700 | a Rombouts, Pieter u TW06 0 801000963286 0 0000-0002-3731-9731 | ||
700 | a De Maeyer, Jeroen u TW08 0 001997078133 0 801001664316 | ||
700 | a Gielen, Georges | ||
650 | a Technology and Engineering | ||
653 | a continuous-time sigma-delta ($\Sigma\Delta$) modulation | ||
653 | a analog-to-digital (A/D) conversion | ||
653 | a Nyquist stability criterion | ||
653 | a robust stability. | ||
653 | a BANDWIDTH | ||
653 | a CMOS | ||
653 | a COMPENSATION | ||
773 | t IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS—II: EXPRESS BRIEFS g IEEE Trans. Circuits Syst. II-Express Briefs. 2010. 57 (6) p.416-420 q 57:6<416 | ||
856 | 3 Full Text u https://biblio.ugent.be/publication/980843/file/980844 z [open] y Nyq_auteurs.pdf | ||
856 | 3 Full Text u https://biblio.ugent.be/publication/980843/file/980845 z [ugent] y Bart_TCASII_2010.pdf | ||
920 | a article | ||
Z30 | x EA 1 TW06 | ||
922 | a UGENT-EA | ||
Z30 | x EA 1 TW08 | ||
922 | a UGENT-EA |
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