Patent ID: 8856712

Claim:
A flip-flop comprising: a plurality of mixed threshold voltage transistors, wherein the plurality of transistors includes standard threshold voltage devices and high threshold voltage devices; a data input, a clock input, and a reset input into the flip-flop; and two output signals from the flip-flop; wherein at least a subset of the transistors at the data input comprises standard threshold voltage devices and at least a subset of the transistors at the output signals and the clock input comprises high threshold voltage devices; further wherein the flip-flop is configured to have the mixed threshold voltage transistors switched based on an effective speed per leakage current for the flip-flop that is calculated as the mixed threshold voltage transistors are iteratively switched between being high threshold voltage devices and standard threshold voltage devices to determine which mixed threshold voltage transistors are standard threshold voltage devices and to determine which mixed threshold voltage transistors are high threshold voltage devices.