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In this paper the system level design of a continuous-time ΔΣ modulator for portable ultrasound scanners is presented. The overall required signal-to-noise ratio (SNR) is derived to be 42 dB and the sampling frequency used is 320MHz for an oversampling ratio of 16. In order to match these requirements, a fourth order, 1-bit modulator with optimal zero placing is used. An analysis shows that the thermal...
This paper deals with a system-level optimization of a back-end of audio signal processing chain for hearing-aids, including a sigma-delta modulator digital-to-analog converter (DAC) and a Class D power amplifier. Compared to other state-of-the-art designs dealing with sigma-delta modulator design for audio applications we take the maximum gain of the modulator noise transfer function (NTF) as a design...
This paper describes the design and experimental evaluation of a multibit Sigma-Delta modulator with enhanced dynamic range (DR) through the use of nonlinear digital-to-analog converters (DACs) in the feedback paths. This nonlinearity imposes a trade-off between DR and distortion, which is well suited to the intended hearing aid application. The modulator proposed...
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