| 摘要 |
PURPOSE:To output a phase error always constant by providing a means extracting phase information, a means generating a control signal and a means controlling a phase error detection gain so as to select and output complex phase error information. CONSTITUTION:The titled circuit consists of a means extracting complex phase error information c1, c2, c3, c4, d1, d2, d3, d4, f, g with respect to specific frequencies among a received signal depending on plural phase error detection gains, a means selecting and outputting plural complex phase error information c1-c4, d1-d4 and a means detecting a level fluctuation of an output signal and generating a control signal. The fluctuation of selected output level is detected, high- order bit complex phase error information c1-c4, d1-d4 with a small detection gain are selected and outputted in case of a large level, and low-order bit complex phase error information c1-c4, d1-d4 with a large detection gain are selected and outputted in case of a small level to obtain a stable phase error (h). Thus, even with a mean extraction level fluctuated, the phase error (h) is detected without any error. |
