Title :
A 1.6V ΔΣ ADC for digital electret microphone
Author :
Yoo, Sejin ; Noh, Gwangyol ; Kim, Kwangsoo ; Ahn, Gil-Cho ; Lee, Jun-Seok ; Lee, Jong-Muk ; Choi, Il Hyun
Author_Institution :
Dept. of Electron. Eng., Sogang Univ., Seoul, South Korea
Abstract :
A switched-capacitor delta-sigma analog-to-digital converter (ADC) including preamplifier and bandgap reference for digital electret microphone is presented. It uses quantization noise coupling to achieve third-order noise shaping with only two integrators. The prototype ADC is fabricated in a 0.18 μm CMOS process. The single-loop, 1-bit, third-order delta-sigma ADC operates at OSR of 64 provides 70.8 dB dynamic range (DR) and 65.7 dB peak signal-to-noise ratio (SNR) over a signal bandwidth of 20 kHz with 1.6 V supply while consuming 1 mW power including preamplifier and on-chip reference.
Keywords :
CMOS digital integrated circuits; analogue-digital conversion; delta-sigma modulation; electrets; microphones; switched capacitor networks; ΔΣ ADC; CMOS process; bandgap reference; bandwidth 20 kHz; digital electret microphone; dynamic range; integrators; on-chip reference; peak signal-to-noise ratio; power 1 mW; preamplifier; quantization noise coupling; signal bandwidth; single loop third-order delta-sigma ADC; size 0.18 mum; switched-capacitor delta-sigma analog-to-digital converter; third-order noise shaping; voltage 1.6 V; Clocks; Couplings; Electrets; Microphones; Modulation; Noise; Preamplifiers; ADC; delta-sigma modulator; electret microphone; noise coupling;
Conference_Titel :
SoC Design Conference (ISOCC), 2010 International
Conference_Location :
Seoul
Print_ISBN :
978-1-4244-8633-5
DOI :
10.1109/SOCDC.2010.5682915
