| 摘要 |
PURPOSE:To compensate the synchronizing step-out of a circuit by providing a fine phase variable circuit to finely vary the phase of a PN sequence on the output of a shift register and controlling the phase by a fine phase deciding circuit. CONSTITUTION:The fine phase variable circuit 13 can finely vary the phase of the PN sequence to be outputted from a shift register 5. The PN sequence to be outputted from the fine phase variable circuit 13 is multiplied with an input signal 8 by a multiplier 1 and passes through an envelope detector 3 and therefore, correlation between both signals can be detected. A fine phase deciding circuit 14 generates a signal to control the fine phase variable circuit 13, searches the phase and decides the phase so that the phase of the input signal 8 can be matched with the PN phase of the fine phase variable circuit 13, namely, that the peak of the correlation can be detected. |
