Programmable phase shift and duty cycle correction circuit and method

[0033]An embodiment of an improved phase shift and duty cycle correction circuit is shown in FIG. 2. In general, the improved circuit enables both rising and falling edges of a generated clock signal to be shifted in time by an independently programmable amount. In some embodiments, the programmable amounts may be set by a manufacturer or end-user of the circuit; however, additional circuit components may be provided, in other cases, for detecting and automatically setting an appropriate phase shift amount. By shifting the rising and falling edges of the clock signal, the improved circuit provides a unique means for correcting, or otherwise modifying, a duty cycle of the generated clock signal. In one embodiment, means for adjusting the phase and duty cycle of the generated clock signal may be implemented with a simple digital-to-analog converter (DAC), programmable by a variety of methods, including but not limited to, register bits, hardwired bits, externally supplied inputs, program