Title :
An ultra low power sigma-delta modulator for hearing aid with double-sampling
Author :
Qi, Da ; Li, Yuan-wen ; Long-Cheng, Long-Cheng ; Xu, Jun ; Ye, Fan ; Ren, Jun-Yan
Author_Institution :
State Key Lab. of ASIC & Syst., Fudan Univ., Shanghai, China
Abstract :
A single-loop third-order switched-capacitor sigma-delta modulator for hearing aid application is presented. Double-sampling is introduced to achieve a high performance with comparative low power consumption. The effect of capacitor mismatch is further discussed. To over come the switch-on problem under low-voltage, bootstrapping is adopted in this design. The modulator is implemented under SMIC 0.13 ¿m mix signal technology, the post simulation results indicates the modulator achieves 92-dB SNDR in 8 kHz signal bandwidth with an OSR of 128. The power consumption is 38 ¿W under 1-V supply voltage and the chip core size is 0.25 mm2.
Keywords :
capacitors; handicapped aids; low-power electronics; mixed analogue-digital integrated circuits; sigma-delta modulation; SMIC mix signal technology; bandwidth 8 kHz; bootstrapping; capacitor mismatch; comparative low power consumption; double-sampling; hearing aid; power 38 muW; power consumption; signal bandwidth; single-loop third-order switched-capacitor sigma-delta modulator; size 0.13 mum; ultra low power sigma-delta modulator; voltage 1 V; Auditory system; Bandwidth; Circuit noise; Circuit topology; Delta-sigma modulation; Energy consumption; Multi-stage noise shaping; Power dissipation; Signal to noise ratio; Voltage; Double-Sampling; Hearing Aid; Sigma-Delta; low-voltage low-power;
Conference_Titel :
ASIC, 2009. ASICON '09. IEEE 8th International Conference on
Conference_Location :
Changsha, Hunan
Print_ISBN :
978-1-4244-3868-6
Electronic_ISBN :
978-1-4244-3870-9
DOI :
10.1109/ASICON.2009.5351366
