A miniaturized gas analyzer formed onto a micro-chip and a method of separating components from a composite gas using the miniaturized gas analyzer are disclosed. The gas analyzer includes an injector block and two column blocks arranged in series along an analytical path. The injector block receives the composite gas and a carrier gas to create a gas sample. The gas sample is then injected into the column blocks to separate the components of the composite gas. Further, a valve used within the miniaturized gas analyzer is disclosed, in which the valve is formed onto the micro-chip and includes a flexible membrane and a rigid substrate.