Title :
A ΔΣ ADC for low power sensor applications
Author :
Salomaa, Jarno ; Yucetas, Mikail ; Kalanti, Antti ; Aaltonen, Lasse ; Halonen, Kari
Author_Institution :
Dept. of Micro & Nanosci., Helsinki Univ. of Technol., Espoo, Finland
fDate :
May 30 2010-June 2 2010
Abstract :
This paper presents a ΔΣ ADC designed for a low power microsensor application. Power saving is achieved by utilizing input signal double sampling and a high impedance CM voltage source. In addition to supply voltage and ground, no low impedance references are used. CDS technique is successfully combined with the circuit utilizing the high impedance CM voltage source. The circuit is implemented in 0.35 μm CMOS process using a 3.6 V supply voltage. The 250 kHz clock for the ADC is generated on-chip. The measured results show an input referred noise density of 1.3 μV/√(Hz) and a maximum SNR of 83 dB for a 1 kHz noise BW. Power consumption of the circuit, excluding the clock generator, is 170 μW.
Keywords :
CMOS integrated circuits; analogue-digital conversion; microsensors; ADC; CDS technique; CMOS process; frequency 250 kHz; high impedance CM voltage source; noise density; power 170 muW; power consumption; power microsensor; signal double sampling; size 0.35 mum; supply voltage; voltage 3.6 V; CMOS process; Circuit noise; Clocks; Density measurement; Impedance; Microsensors; Noise generators; Power measurement; Signal sampling; Voltage;
Conference_Titel :
Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium on
Conference_Location :
Paris
Print_ISBN :
978-1-4244-5308-5
Electronic_ISBN :
978-1-4244-5309-2
DOI :
10.1109/ISCAS.2010.5537972
