Bart De Vuyst

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—In this paper we introduce a figure of merit for the robustness of continuous-time Σ∆ modulators. It is based on the Nyquist criterion for the equivalent discrete-time (DT) loop filter. We show how continuous-time modulators can be designed by optimizing this figure of merit. This way we obtain modulators with increased robustness against variations in the(More)
An anti-aliasing filter that incorporates a sampler is proposed to precede noise-shaping analog-to-digital converters (ADCs), such as discrete-time ΔΣ modulators. The architecture of the proposed anti-aliasing filter is inspired by the implicit anti-aliasing filtering property of CT ΔΣ modulators. However, contrary to CT ΔΣ modulators, the proposed(More)
—In this paper we present a framework for robust design of continuous-time Σ∆ modulators. The approach allows to find a modulator which maintains its performance (stability, guaranteed peak SNR,. . .) over all the foreseen parasitic effects, provided it exists. For this purpose, we have introduced the S-figure as a criterion for the robustness of a(More)
In this paper a self-oscillating ΣΔ modulator is presented. By introducing this self-oscillation in the system, the loop filter operates at a speed significantly lower than dictated by the clock frequency. This allows for a simple and power efficient design of the opamps used in the loop filter. The self-oscillation is induced here by(More)
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