This paper presents an edge boosting method for I/O output buffer using signal front detection digital control circuit. The presented architecture detects I/O data or clock signal transitions and activates additional drive strength fingers in the output buffer resulting in output current increase which improves the slew rate, compensating for losses in transmission lines. The presented edge boosting method can be used in the I/O circuits of such standards as DDR(Double Data Rate), USB(Universal Serial Bus), PCI(Peripheral Component Interconnect) etc.