Digital phase difference measuring circuit

摘要

The circuit determines the phase difference between an actual signal (I) and a reference signal (R). It uses a digital phase detector (15) comparing the actual signal with the differentiated reference signal (dR), to provide a binary signal (BI)representing their phase difference. The reference signal is fed to a delay chain (13), halted in an attained logic state when the differentiated reference signal reaches a defined logic state. It is evaluated by an evaluation stage (12) to provide a second binary word (B2), combined with the first binary signal. Thus it provides an output binary word (D) representing the phase difference.