Title :
A pulse-based amplifier and data converter for bio-potentials
Author :
Tang, Wei ; Culurciello, Eugenio
Author_Institution :
Electr. Eng. Dept., Yale Univ., New Haven, CT, USA
Abstract :
We present a low-power pulse-based amplifier and data conversion circuit for recording bio-potentials. The circuit is designed for data reduction in neurophysiological sensor and communication systems. A low-power low-noise AC amplifier with an asynchronous delta A/D converter is implemented. The asynchronous delta modulation has the advantage of data reduction, clock-less and no quantization noise. The amplifier gain is 53 dB (bandwidth of 200 Hz-20 kHz) with DC variation rejection. The input-referred rms noise is 2 muV. The delta amplitude in the A/D converter is 0.1 V at 3.3 V voltage supply. The system is fabricated with AMI 0.5 mum CMOS technology. The chip size is 1191 mum by 713 mum. The power consumption with 3.3 V supply is 75.9 muW in static state and 194.7 muW with 60 kbps data conversion rate. A graphic user interface was developed to monitor the transmitted signal in real time.
Keywords :
CMOS integrated circuits; amplifiers; analogue-digital conversion; biosensors; data conversion; low-power electronics; CMOS technology; asynchronous delta A/D converter; asynchronous delta modulation; bandwidth 200 Hz to 20 kHz; bio-potentials; bio-potentials recording; data conversion circuit; data converter; data reduction; gain 53 dB; low-power amplifier; low-power low-noise AC amplifier; neurophysiological sensor; power 75.9 muW; pulse-based amplifier; size 0.5 mum; size 1191 mum; size 713 mum; voltage 0.1 V; voltage 2 muV; voltage 3.3 V; Biosensors; CMOS technology; Clocks; Data conversion; Delta modulation; Low-noise amplifiers; Pulse amplifiers; Pulse circuits; Quantization; Sensor systems;
Conference_Titel :
Circuits and Systems, 2009. ISCAS 2009. IEEE International Symposium on
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-3827-3
Electronic_ISBN :
978-1-4244-3828-0
DOI :
10.1109/ISCAS.2009.5117754
