| 摘要 |
<p>PURPOSE:To reduce the power consumption by preventing a signal from being inputted to frequency dividers in succeeding stages from a frequency divider which outputs the selected signal out of a group of frequency dividers. CONSTITUTION:The frequency divider group where frequency dividers 310 to 312, each of which divides the frequency of the signal from the preceding stage by a prescribed frequency division ratio and outputs the result, are connected in series, a selecting circuit 320 which takes respective output signals of frequency dividers 310 to 312 as the input and selects one of these signals by a select signal to output it, and means 100 to 102, 111, 112, and 321 which prevent the signal input to frequency dividers in succeeding stages from the frequency divider which outputs the selected signal in the frequency divider group in response to the select signal are provided. Thus, only required frequency dividers are operated to reduce the current consumed by the operation of unnecessary frequency dividers.</p> |
