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A 155 /spl mu/W 88-dB DR Discrete-Time /spl Delta/ /spl Sigma/ Modulator for Digital Hearing Aids Exploiting a Summing SAR ADC Quantizer

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8 Author(s)
Porrazzo, S. ; Electr. Eng. Dept., Mixed Signal Microelectron. Group, Eindhoven Univ. of Technol., Eindhoven, Netherlands ; Morgado, A. ; San Segundo Bello, D. ; Cannillo, F.
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This paper presents a low-power switched-capacitor ΔΣ modulator for digital hearing-aid applications that features a novel summing successive approximation (SAR). The summing SAR performs multi-bit quantization together with the analog addition required in feed-forward (FF) ΔΣ modulator (ΔΣM) topologies, with no attenuation of the input signals and no need for amplifiers. The prototype is implemented in a 0.18- μm CMOS technology and its measurements demonstrate a dynamic range of 88 dB in 10 kHz bandwidth while consuming 155 μW from a 1.8 V supply. The combined use of passive addition and SAR quantization reduces the complexity and power consumption of the modulator. The summing SAR ADC quantizer results in a calculated power saving of 40% when compared to a multi-bit FF ΔΣM using active addition and flash quantization.

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Biomedical Circuits and Systems, IEEE Transactions on  (Volume:7 ,  Issue: 5 )