| 摘要 |
PURPOSE:To compare the voltage value with a prescribed value accurately to store the receivig frequency accurately, by controlling the inclination and the threshold voltage of the saw tooth wave. CONSTITUTION:A saw tooth wave is caused to rise synchronously with control signal C1 corresponding to the prescribed count value output of counter 2, and the threshold voltage and the inclination are controlled by control signal C2 and C3 of the first and the second phase synchronizing loops. When the comparison voltage value of the saw tooth wave becomes VL and VH, prescribed digital values are set to memory 3 respectively. |
