A 155µW 88-dB DR discrete-time ΔΣ modulator for digital hearing aid applications

A 155µW 88-dB DR discrete-time ΔΣ modulator for digital hearing aid applications

In this paper we present a low-power switched-capacitor ΔΣ modulator for digital hearing-aid applications. The circuit adopts a novel summing successive approximation (SAR) block to perform multi-bit quantization together with the analog addition that is required in feed-forward topologies. The use...

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Hauptverfasser: Porrazzo, S., Morgado, A., San Segundo Bello, David, Cannillo, F., Van Hoof, C., van Roermund, A. H. M., Cantatore, E.
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Bandwidth
Capacitors
Dynamic range
Modulation
Power demand
Quantization
Topology
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Beschreibung
Zusammenfassung:In this paper we present a low-power switched-capacitor ΔΣ modulator for digital hearing-aid applications. The circuit adopts a novel summing successive approximation (SAR) block to perform multi-bit quantization together with the analog addition that is required in feed-forward topologies. The use of passive addition and SAR operation helps in reducing the complexity and power consumption of the modulator. The prototype is implemented in a 180 nm CMOS technology and measurements demonstrate 88 dB of dynamic range in a 10 kHz band while consuming 155μW from a 1.8V supply.
ISSN:2163-4025
2766-4465
DOI:10.1109/BioCAS.2012.6418450