Esmaeil N. Aghdam

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— A robust and hardware efficient dynamic element matching (DEM) algorithm is developed and used to design a 4 th-order bandpass (BP) mismatch-shaping circuit, moved inside the feedback loop of a 6 th-order bandpass continuous-time delta-sigma modulator. This algorithm is based on a shortened tree-structured scheme (ST DEM) which can assure a stable high(More)
— Resolution of a multibit delta-sigma modulator (DSM) is limited by its internal digital-to-analog converter (DAC) nonlinearity that is usually caused by circuit mismatch errors while realizing. Recently, some dynamic element matching (DEM) methods were proposed for reducing mismatch errors. Two main difficulties of different dynamic element matching (DEM)(More)
A dual mode re-configurable Delta Sigma Modulator (DSM) for ultrasonic applications is presented in this article. The proposed modulator handles two operating modes: B-mode and Continuous Wave (CW) Doppler mode. For B-mode operation a low pass modulator was designed which was modified by Noise Shaping Enhancement (NSE) technique. It achieves 71.7 dB (Signal(More)
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