Bart De Vuyst

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Self-oscillating modulators are a class of modulators that combines noise shaping with pulsewidth modulation (PWM). Moreover, in such a modulator, the PWM carrier is generated by a self-oscillation mode that is deliberately introduced. In our approach, this self-oscillation is accurately controlled by a digital delay in the feedback loop. The concept is(More)
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)
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)
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 antialiasing filtering property of CT ΔΣ modulators. However, contrary to CT ΔΣ modulators, the proposed(More)
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