Abstract: A buffer circuit includes a chain of a plurality of inverters. A first inverter has transistors with a size to present a first predetermined capacitive loading at its input. This is selected with regard to the target operating frequency of the driving circuit (typically a flip-flop) and the transistor size selected for this driving circuit. Each inverter has transistors with a size a predetermined size factor greater than the transistors of a preceding inverter. The first inverter has transistors the size factor larger than the driving circuit. The size factor is preferably 3. The number of inverters in the chain is selected so that the last inverter has transistors with a size to drive its output capacitive loading with a maximum rise and fall time corresponding to the target frequency. If the number of inverters is even, then the buffer input is connected to a normal output of the driving circuit.