Phase-locked loop with a digital phase transfer function to self-correct

摘要

Phase locked loop, includes the phase digital transmitter part, and the new correction part. The phase digital transmitter (PDC) the part outputs the stream of 1st phase error word. The new correction part receives 1st phase error word, and forms the stream of the 2nd phase error word which is supplied to the loop filter. The PDC part has the phase digital transfer function which shows the imperfection of a certain kind. Regarding 1st example, the correction part decides the average difference between opposite of 1st phase error word, and uses this average difference in order to formalize 1st phase error word in order to correct concerning the change in inclining of transfer function of the PDC part which originates in the change of delay element propagation delay. Regarding 2nd example, as for the correction part, it corrects concerning the profit mismatch in the transfer function of the PDC part. Regarding 3rd example, as for the correction part, it corrects concerning the offset mismatch in the transfer function of the PDC part.