This paper is mainly focused on the design and simulation of a micromachined CMOS-MEMS resonator for gas sensing applications. The principle of detection of the gaseous species is based on the change in resonant frequency of the microresonator as a result of the adsorption of an analyte molecule onto the surface of the active material deposited on the microresonator resulting into a change of the mass of the microresonator device. Coventor Ware simulation software is used to design and simulate the micromachined microresonator gas sensing platforms. Simulation results show a resonant frequency of 20162.3 Hz for the resonator. © 2012 American Institute of Physics.