A carbon dioxide dry cleaning system features a pair of liquid carbon dioxide storage tanks in communication with a compressor. To produce a stable internal clock signal to perform the long integration, an external clock signal is received from a highly stable source, such as a wireless communication base station or a nearby femtocell. In one embodiment of a method for designing a clock gating circuit, the method comprises providing a schematic layout of a D-type flip-flop, wherein the flip-flop has a reset terminal and two latches.