Title :
A 155µW 88-dB DR discrete-time ΔΣ modulator for digital hearing aid applications
Author :
Porrazzo, Serena ; Morgado, Alonso ; San Segundo Bello, David ; Cannillo, Francesco ; Van Hoof, Chris ; van Roermund, Arthur H. M. ; Cantatore, Eugenio
Author_Institution :
Mixed-signal Microelectron. Group, Eindhoven Univ. of Technol., Eindhoven, Netherlands
Abstract :
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.
Keywords :
CMOS integrated circuits; biomedical electronics; discrete time systems; feedforward; hearing aids; low-power electronics; modulators; power consumption; switched capacitor networks; CMOS technology; analog addition; digital hearing aid applications; discrete-time ΔΣ modulator; feed-forward topology; frequency 10 kHz; low-power switched capacitor ΔΣ modulator; multibit quantization; power 155 muW; power consumption; size 180 nm; summing successive approximation; voltage 1.8 V; Bandwidth; Capacitors; Dynamic range; Modulation; Power demand; Quantization; Topology;
Conference_Titel :
Biomedical Circuits and Systems Conference (BioCAS), 2012 IEEE
Conference_Location :
Hsinchu
Print_ISBN :
978-1-4673-2291-1
Electronic_ISBN :
978-1-4673-2292-8
DOI :
10.1109/BioCAS.2012.6418450
