PURPOSE: To prevent unnecessary from flowing by constructing a T-FF following on the T-FF on the input by means of an FET with the gate length longer than the FET constituting the input terminal. side T-FF.
CONSTITUTION: T-type flip-flops (T-FF) 10 to 15 have function outputting the halved frequency of the inputted signal. Therefore, when a signal with frequency f0 is inputted from an input terminal 16, it is outputted from an output terminal 17 and the frequency f6 becomes f0/64. In the gate length of the field-effect transistor (FET) constituting T-FFs 14 and 15 after the fifth stage T-FF 14 makes the double of the gate length of the FET constituting the T-FF 10 to 13 on the input terminal 16. When the gate length of the FET is prolonged, the current flowing under the same condition deteriorates. Thus, the low power consumption of the divider circuit IC can be realized by using the FET with long gate length for the T-FF at the low-speed operation part.
MURATA KOICHI
SUZUKI MASAO
