Title :
1.4V 13μW 83dB DR CT-ΣΔ modulator with Dual-Slope quantizer and PWM DAC for biopotential signal acquisition
Author :
Cannillo, Francesco ; Prefasi, Enrique ; Hernández, Luis ; Pun, Ernesto ; Yazicioglu, F. ; Van Hoof, C.
Author_Institution :
Imec, Leuven, Belgium
Abstract :
High-resolution Sigma-Delta (ΣΔ) ADCs are increasingly used in portable medical applications for the measurement of biopotential signals. This paper presents the implementation and measurements of a novel ultra-low power low voltage multi-bit continuous-time sigma-delta (CT-ΣΔ) modulator, whose quantizer and feedback DACs operate in the time domain. Instead of the conventional flash quantizer and mismatch corrected multi-bit feedback DACs, a Dual-Slope (DS) quantizer and a Pulse-Width Modulated (PWM) DACs have been adopted in this design. The modulator has been implemented in a standard 0.18μm CMOS technology and features 83dB dynamic-range (DR) for a signal bandwidth of 256Hz. When clocked at 917kHz it consumes 13.3μW from a 1.4V supply.
Keywords :
CMOS integrated circuits; bioelectric potentials; biomedical electronics; low-power electronics; portable instruments; pulse width modulation; quantisation (signal); sigma-delta modulation; CMOS technology; CT-sigma-delta modulator; PWM DAC; bandwidth 256 Hz; biopotential signal acquisition; biopotential signal measurement; dual slope quantizer; high resolution sigma-delta ADC; portable medical application; power 13.3 muW; pulse width modulated DAC; size 0.18 mum; ultra low power low voltage multibit continuous time sigma-delta modulator; voltage 1.4 V; Bandwidth; CMOS integrated circuits; Clocks; Frequency modulation; Pulse width modulation; Signal resolution;
Conference_Titel :
ESSCIRC (ESSCIRC), 2011 Proceedings of the
Conference_Location :
Helsinki
Print_ISBN :
978-1-4577-0703-2
Electronic_ISBN :
1930-8833
DOI :
10.1109/ESSCIRC.2011.6044958
