The present invention describes systems and methods for providing a power optimized waveform. A phase detector uses two feedback signals to detect a phase of an external clock signal based on a phase difference between the two feedback signals, thereby enabling a more accurate determination as to when to transition from a coarse-lock to a fine-lock delay. 11a standard is modified in this way. The oxygen concentration in the metal conductive layer for the N-channel transistor is different from that for the P-channel transistor.