Title :
A Low-Power Low-Voltage Amplifier for Heart Rate Sensor
Author :
Lim, Gin Kooi ; Teo, T. Hui
Author_Institution :
Integrated Circuits & Syst. Lab., Inst. of Microelectron., Singapore
Abstract :
The demand for health-monitoring products is increasing worldwide. Low-power and low-voltage attributes are important concerns that need to be addressed in circuits used for personal health-monitoring applications, to achieve a long battery life. In this paper, a low-power low-voltage OTA used in a heart rate sensor is presented in a MOS-bipolar pseudo-resistor configuration. Super source degeneration, bulk driving and adjustable transconductance techniques are applied to achieve low power and low-voltage criteria. The OTA consumes current of 700 nA from a 1V single supply. As per the simulations, the circuit achieves 22kHz bandwidth (from 50mHz to 22kHz) at a closed loop gain of 14dB while driving a load capacitance of 80pF. The circuit is implemented in 0.18mum CMOS technology
Keywords :
CMOS integrated circuits; biomedical electronics; biosensors; cardiology; low-power electronics; operational amplifiers; patient monitoring; 0.050 to 22 kHz; 0.18 micron; 1 V; 14 dB; 22 kHz; 700 nA; 80 pF; CMOS technology; MOS-bipolar pseudoresistor configuration; battery life; bulk driving; heart rate sensor; low-power low-voltage amplifier; operational transconductance amplifier; personal health-monitoring applications; super source degeneration; Band pass filters; Batteries; CMOS technology; Circuits; Filtering; Heart rate; Laboratories; Low pass filters; Sensor phenomena and characterization; Voltage; Low-power; adjustable transconductance technique; bulk driving; low-voltage; super source degeneration;
Conference_Titel :
Circuits and Systems, 2006. APCCAS 2006. IEEE Asia Pacific Conference on
Conference_Location :
Singapore
Print_ISBN :
1-4244-0387-1
DOI :
10.1109/APCCAS.2006.342518
