US Patent 7525354 Local coarse delay units

Methods, circuits, devices, and systems are provided, including embodiments with local coarse delay units. One embodiment includes generating a first delayed signal, a second delayed signal, and a third delayed signal by delaying a clock reference signal with various time delays of a coarse delay line and local coarse delay units. This method embodiment also includes generating a clock output signal based on the first delayed signal, the second delayed signal, or the third delayed signal, depending on a phase difference between the clock reference signal and the clock output signal.