Title :
A 0.5V 94dB SNR CT-ΣΔ modulator for implantable and portable biomedical devices
Author :
Bautista, Farid ; Martínez-Chapa, Sergio O. ; Rossetto, Olivier ; Dieck-Assad, Graciano
Author_Institution :
CNRS/IN2P3, Univ. Joseph Fourier, Grenoble, France
Abstract :
A CT-ΣΔ Modulator having very low power dissipation is presented in this paper. The device was implemented on 0.35μm CMOS technology and it consists of a second order modulator and a decimation stage based upon a finite impulse response (FIR) filter. The modulator and the FIR stages supply voltages are 0.5V and 1V, respectively. The modulator measured characteristics are: signal to noise ratio (SNR) of 94.2dB, effective number of bits (ENOB) of 15.35 bits, integral no linearity (INL) of +0.34/-2.3 LSB, differential no linearity (DNL) of +0.78/-0.62 LSB without missing a single code, and a power dissipation of only 7μW. An exhaustive literature review revels that this is the first ADC operating at 0.5V, having a 0 to 100Hz bandwidth (BW) and showing a SNR greater than 94dB. This ADCs performance is suitable for very low power biomedical applications such as implantable and portable devices.
Keywords :
FIR filters; biomedical electronics; biomedical equipment; low-power electronics; prosthetics; sigma-delta modulation; 0.35μm CMOS technology; ADC; CT-ΣΔ modulator; bandwidth 0 Hz to 100 Hz; decimation stage; finite impulse response filter; implantable biomedical devices; low power dissipation; noise figure 94 dB; portable biomedical devices; second order modulator; very low power biomedical applications; voltage 0.5 V; Biomedical monitoring; Monitoring; Signal to noise ratio; analog-digital conversion; implantable biomedical devices; sigma delta modulator;
Conference_Titel :
Electronics, Circuits, and Systems (ICECS), 2010 17th IEEE International Conference on
Conference_Location :
Athens
Print_ISBN :
978-1-4244-8155-2
DOI :
10.1109/ICECS.2010.5724572
