Title :
A 290-µW 25-kHz continuous-time delta-sigma modulator for acoustic sensor networks
Author :
Choi, Youngkil ; Kim, Hyungjoong ; Roh, Hyungdong ; Roh, Jeongjin
Author_Institution :
Dept. of Electr. Eng., Hanyang Univ., Ansan, South Korea
Abstract :
This paper presents the design of a continuous-time delta-sigma (ΔΣ) modulator for acoustic sensor networks. A feed-forward structure without a summing block is used to reduce the power consumption of the ΔΣ modulator. A high-linearity active-RC filter is used to improve the resolution of the ΔΣ modulator. A low-power, high-resolution fourth-order continuous-time ΔΣ modulator with 1-bit quantization was developed by using 0.13-μm, 1-poly 8-metal CMOS technology, with a core area of 0.58 mm2. Simulation results show that the modulator achieved 91.3-dB SNDR (signal-to-noise plus distortion ratio) over a 25-kHz signal bandwidth with an oversampling ratio of 64, while dissipating 290 μW of power from a 3.3-V supply.
Keywords :
CMOS integrated circuits; acoustic transducers; active filters; delta-sigma modulation; distributed sensors; 1-bit quantization; CMOS technology; acoustic sensor networks; continuous-time delta-sigma modulator; feedforward structure; frequency 25 kHz; high-linearity active-RC filter; low-power high-resolution fourth-order continuous-time ¿¿ modulator; power 290 μW; Acoustic distortion; Acoustic sensors; Bandwidth; CMOS technology; Delta modulation; Energy consumption; Feedforward systems; Filters; Quantization; Signal resolution; Acoustic sensor; continuous-time; delta-sigma modulator; high resolution; 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.2009.5351278
