Signal Conditioning ASIC for the Detection of Combustible Gases

In this paper, the signal conditioning ASIC has been designed for transferring the information regarding gas concentration from the hazardous environment of coal mines to the control room. The ASIC is designed to avoid danger in the hazardous working environment with features like high operating temperature, faster response, high sensitivity, and low power consumption. For the desired application, the different modules for ASIC including Low Noise Amplifier (LNA), Voltage Controlled Oscillator (VCO), and Zero Crossing Detector integrated with a buffer are designed based on 180nm CMOS technology node using SCL pdk files on Cadence Virtuoso tool. The overall power consumption of the designed ASIC is 3.92mW with a gain of ~15 and a frequency range of 10KHz to 200KHz for 0.1% gas concentration for a sensor with the operating temperature of ~150oC. The final output of the ASIC is 0V to 1.8V of the square wave which can be further transmitted to the control room.