Switched-capacitor circuits are compatible with CMOS technology, accurate in time constant and besides, have good linearity in voltage. Therefore, they are widely used in filters, A/Ds and other circuits. The two phase non-overlap clock generator is one of the building blocks of the switch capacitor circuit. It generates non-overlap clock to control nodes not to be driven by two voltage sources. It also generates earlier turn off clock which can solve the charge injection problem. This paper analyzes the traditional non-overlap clock generator in detail, and then gives one with independent pulse width adjusting. Finally it shows how it can help lowering the power consumption in ΔΣ modulators, pipeline A/Ds and filters.