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Low-noise micro-power chopper amplifier for MEMS gas sensor

Nebhen J., Meillere S., Masmoudi M., Seguin J.-L., Barthelemy H., Aguir K.

International Journal of Microelectronics and Computer Science

2011

Vol. 2, nr 4

146-155

In this paper, a low-noise, low-power and low voltage Chopper Stabilized CMOS Amplifier (CHS-A) is presented and simulated using transistor model parameters of the AMS 0.35 μm CMOS process. This CHS-A is dedicated to high resistive gas sensor detection. The proposed CHS-A using Chopper Stabilization technique (CHS) exhibits an equivalent input referred noise of only 0.194 nV/√Hz for a chopping frequency of 210 kHz under ۫.25 V supply voltage and 26.5 dB voltage gain. The inband PSRR is above 90 and the CMRK exceeds 120 dB. At the same simulation condition, the total power consumption is 5 μW only.

Structural and optical properties of thermochromic bilayers CeO2-VO2

Saitzek S., Guirleo G., Guinneton F., Sauques L., Villain S., Aguir K., Leroux C., Gavarri J.R.

Inżynieria Materiałowa

2004

R. XXV, nr 3

653-655

Using Radio-Frequency reactive sputtering techniques, thin films of thermochromic vanadium dioxide (presenting a insulator-metal phase transition at Tc = 68°C) were covered by a cerium dioxide layer. Cerium dioxide was chosen for its chemical stability, infrared optical transparency and strong optical absorption in the ultrafiolet range. Vanadium dioxide was first deposited on a silica substrate by Radio Frequency reactive sputtering. Then, a ceria thin film was deposited on the vanadium dioxide film by the same technique. The bilayers were characterized by X-ray diffraction measurements, scanning electron microscopy, transmission electron microscopy and ellipsometry techniques. Optical properties were studied by infrared spectroscopy. The optical properties of these bilayers are similar to optical properties observed for non-coated pure vanadium dioxide films.