A 0.39mA 92dB modified-feedback ΣΔ modulator for digital RF hearing aid with 1.2V supply voltage in 0.35µm CMOS

Author

Chang, Long-Xi ; Shia, Tim-Kuei

Author_Institution

Ind. Technol. Res. Inst., Hsinchu, Taiwan

fYear

2011

fDate

25-28 April 2011

Firstpage

1

Lastpage

4

Abstract

A 0.39 mA 92 dB dynamic range switch-capacitor (SC) third-order ΣΔ modulator for a digital RF hearing aid in 0.35 μm CMOS is presented here. A modified-feedback topology is used here that effectively achieves a high dynamic range and the low power consumption. In the implementation, the bootstrapping-switch and the low-voltage wide-swing OTA are essentially designed for 1.2 V supply voltage with the 0.35 um CMOS process. In the measurement result, this modulator achieves 90 dB SNR in a 10-KHz bandwidth with an oversampling ratio of 128, and its power consumption is 0.47 mW with a good FOM of 555e-6.

Keywords

CMOS digital integrated circuits; bootstrap circuits; feedback; hearing aids; operational amplifiers; sigma-delta modulation; switched capacitor networks; CMOS process; bandwidth 10 kHz; bootstrapping-switch OTA; current 0.39 mA; digital RF hearing aid; dynamic range switch-capacitor third-order ΣΔ modulator; low-voltage wide-swing OTA; modified-feedback ΣΔ modulator; noise figure 90 dB; noise figure 92 dB; power 0.47 mW; power consumption; size 0.35 mum; voltage 1.2 V; CMOS integrated circuits; Clocks; Dynamic range; Modulation; Power demand; Switches; Switching circuits;

fLanguage

English

Publisher

ieee

Conference_Titel

VLSI Design, Automation and Test (VLSI-DAT), 2011 International Symposium on

Conference_Location

Hsinchu

ISSN

Pending

Print_ISBN

978-1-4244-8500-0

Type

conf

DOI

10.1109/VDAT.2011.5783587

Filename

5783587