A New Noise Shaping Approach for Sigma-Delta Modulators Using Two-Stage Feed-Forward Delays and Hybrid MASH-EFM

Sigma-delta modulators use a noise-shaping technique to curtail the noise power in the band of interest during digital-to-analog conversion. Error feedback modulator employs an efficient noise transfer function for time varying inputs than any other sigma-delta modulators. However, the efficiency of...

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Bibliographic Details
Published in:Electronics (Basel) 2023-02, Vol.12 (3), p.740
Main Authors: Ijaz, Khalid, Adnan, Muhammad, Toor, Waqas Tariq, Butt, Muhammad Asim, Idrees, Muhammad, Ali, Usman, Hassan, Izaz, Ghadi, Yazeed Yasin, Awwad, Fuad A., Abonazel, Mohamed R., Ashraf, Syed Rehan
Format: Article
Language:English
Subjects:
Design and construction
Digital to analog conversion
Error feedback
Methods
Microelectromechanical systems
Modulators
Modulators (Electronics)
Saturation
Signal processing
Spectrum allocation
Transfer functions
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Summary:Sigma-delta modulators use a noise-shaping technique to curtail the noise power in the band of interest during digital-to-analog conversion. Error feedback modulator employs an efficient noise transfer function for time varying inputs than any other sigma-delta modulators. However, the efficiency of the conventional noise transfer function degrades and the quantizer saturation issue provokes when the input signal reaches to full scale. This work proposes a new noise transfer function which is a combination of transfer functions of two-stage Feed-forward delays and a novel Hybrid multi-stage noise shaping-error feedback sigma-delta modulator. The noise transfer function of two-stage Feed-forward delays mitigates the concern of quantizer saturation. The noise transfer function offered by the Hybrid multi-stage noise shaping-error feedback architecture provides sustainable solutions to limit cycles and idle tones. The simulation concludes that the proposed noise-shaping approach obtains comparatively high signal-to-quantization noise ratio than the conventional error feedback modulators. Other performance parameters like spurious-free dynamic range, effective number of bits and signal-to-noise plus distortion ratio are also significantly improved.
ISSN:2079-9292
2079-9292
DOI:10.3390/electronics12030740