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

fYear

2010

fDate

May 30 2010-June 2 2010

Firstpage

3100

Lastpage

3103

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ISCAS.2010.5537972

Filename

5537972