Design and Simulation of Integrated CMOS Compatible Gas Identification

This paper presents an integrated CMOS compatible gas identification system for use with any type of metal-oxide gas sensor array. The logarithmic spike generation unit translates the output from any metal oxide gas sensor array into a spike pattern. The spike sequence matching circuit then compares this spike pattern with a reference set of data performing pattern recognition. The simulation results illustrate that a particular gas generates a unique spike ordering sequence, which has a significant advantage of being independent of the gas concentration. The spike sequence matching circuit then successfully identifies the corresponding gas. Index Terms—Gas identification, Gas sensor array, Spike generation, Spike sequence matching