An analog front-end circuit for CO2 sensor readout in 0.18-μm CMOS process
Journal
2019 International Symposium on VLSI Design, Automation and Test, VLSI-DAT 2019
Date Issued
2019
Author(s)
Abstract
An analog front-end (AFE) trans-impedance amplifier (TIA) for CO2 detector is presented. It senses the current generated from the IR detector, which contains the information of the CO2 concentration in the air. An automatic IR sensor baseline current calibration loop is proposed to cancel the diode DC current and amplify only the desired signal. The prototype is implemented in the 0.18-μm CMOS process. The measurement is performed with an off-chip resistor with voltage input, emulating the IR detector. It consumes 3.38 mW (including calibration) with 62.4-dB SNR over 1-kHz BW and achieves 0.16 ppm resolution. © 2019 IEEE.
Subjects
Analog front-end; CO2 detector; Trans-impedance amplifier
SDGs
Other Subjects
Calibration; Carbon dioxide; Infrared detectors; Timing circuits; VLSI circuits; Analog front end; Analog front end circuits; CMOS processs; CO2 concentration; Dc current; Desired signal; Trans impedances; Voltage input; CMOS integrated circuits
Type
conference paper