Duane Morris LLP
Method and apparatus for signal phase calibration
A method for signal phase calibration includes providing multiple periodic clock signals, including a reference signal and multiple phase shifted versions of the reference signal. The signals have a common frequency and are shifted from one another by multiples of a phase offset. An edge of a first signal is detected. The first signal is one of multiple phase shifted versions of the reference signal. The edge is a transition from a first logic value to a second logic value. The second logic value of the first signal is compared, upon detection of the edge, to a logic value of a second signal that is one of the first plurality of periodic clock signals other than the first signal. An inversion of the first signal is selectively provided based on an outcome of the comparison.
Taiwan Semiconductor Manufacturing Co., Ltd.
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H03L H03B H03K
additional additional inventional
Mao-Hsuan Chih-Hsien Min-Shueh
Chou Chang Yuan