| 摘要 |
PURPOSE:To suppress jitters by controlling the phase of a sampling pulse of an A-D converter continuously. CONSTITUTION:The A-D converter 1 digitizes a reception signal, a timing extraction circuit 2 extracts a timing signal from the reception signal and a vector conversion circuit 3 converts the scaler quantity into the vector quantity. Then a low-pass filter 4 removes high-frequency components and an APC circuit 7 changes the phase of a sampling frequency analogically, that is, continuously depending on the phase of the input vector to control a voltage controlled oscillator 8. Then the output clock of the voltage-controlled oscillator 8 samples the A-D converter. |
