The stable and low-power heating characteristics of a microheater are
very important for the micro gas sensor. Membrane-type gas' sensors ha
ve been fabricated by silicon IC technology. Steady-state thermal anal
ysis by the finite-element method is performed to optimize the thermal
properties of the gas sensor. From the analysis, the desirable size o
f the microheater for low power consumption is determined. The heating
properties of fabricated poly-Si and Pt microheaters have been tested
. The sensing characteristics of the packaged microsensor are also exa
mined.