1,721,444 research outputs found
A 160 dB Equivalent Dynamic Range Auto-Scaling Interface for Resistive Gas Sensors Arrays
No full textIn this paper an integrated wide-dynamic-range interface circuit for resistive gas-sensors arrays is presented. The proposed device consists of a multi-scale transresistance continuous time amplifier followed by a 13-bit incremental A/D converter. The circuit selects automatically the scale to use for each measurement and includes two digital-to-analog converters for the calibration of offset and gain of each scale. The proposed interface circuit achieves a measurement accuracy almost always better than 0.1% over a sensor resistance range of more than 5 decades [100 Ω
– 20 MΩ], leading to an equivalent dynamic range of about 160 dB. The chip has been realized with a 0.35 μm CMOS technology and occupies an area of 3.1 mm^2 consuming 6 mW from a 3.3 V power supply
A 141-dB Dynamic Range CMOS Gas-Sensor Interface Circuit without Calibration with 16-Bit Digital Output Word
No full textIn this paper, we present the design and the characterization of a wide-dynamic-range interface circuit for resistive gas-sensors able to operate without calibration. The circuit is based on resistance-to-frequency conversion, which guarantees low complexity. The state-of-the-art of this measurement method has been improved first by separating the Resistance value Controlled Oscillator circuit (RCO) from the sensing device, thus leading to higher linearity performance, and then by exploiting a novel digital frequency measurement system. Measurement results on a silicon prototype, designed in a 0.35-μm CMOS technology, show that the circuit achieves, without calibration, a precision in resistance measurement of 0.4% over a range of 4 decades and better than 0.8% over 5 decades (dynamic range, DR = 141 dB). Furthermore, after calibration, it reaches a precision of 0.4% for resistance values ranging between 1 kΩ and 1 GΩ, thus leading to a DR of 168 dB. The prototype chip consumes less than 15 mW from a 3.3-V supply
A 6.4 mW, 4.9 nV/√Hz, 24 dBm IIP3 VGA for a multi-standard (WLAN, UMTS, and Bluetooth) receiver
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