A Second-order Sigma-delta Modulator with a Hybrid Topology in 180nm CMOS

Kozlov, Alexey S.; Pilipko, Mikhail M.

doi:10.1109/eiconrus49466.2020.9039246

Cited by 10 publications

(1 citation statement)

References 6 publications

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“…This technique conveniently provides high signal-to-quantization noise ratio (SQNR), which makes it important to use in super audio CD format. It is widely used in recent data acquisition systems, Microelectromechanical systems (MEMS), inertial sensors, image sensors, wireless technologies such as long-term evolution advanced (LTE-Advanced), global system for mobile Telecommunication (GSM) and code-division multiple-access (CDMA) etc., where high speed ADCs with wide bandwidth, low noise and less glitch-induced harmonic distortion are required [1][2][3][4][5][6][7][8][9]. Portable audio playback devices, which perform digital-to-analog conversion also make use of it.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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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.

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