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    • 10. 发明专利
    • VARIABLE FREQUENCY DEVIDER
    • JPH09261048A
    • 1997-10-03
    • JP25716496
    • 1996-09-27
    • SANYO ELECTRIC COTOKYO SANYO ELECTRIC CO
    • WASHIMI IKUAKI
    • H03L7/197H03K23/64H03K23/68H03L7/183
    • PROBLEM TO BE SOLVED: To provide a variable frequency divider which is able to make N+1/2 frequency divisions by using a programmable frequency divider operated at the same speed as frequency division by N. SOLUTION: A programmable frequency divider means 1 frequency-divides an input signal at a frequency division ration N (N is an integer) and at a frequency division ration N+1 alternately. A 1st signal generating means 4 generates a 1st signal synchronized with an output signal of the programmable frequency divider means. A 2nd signal generating means 6 generates a 2nd signal that is obtained by delaying the 1st signal by a half period of the input signal. An output means 13 selects alternately the 1st signal or the 2nd signal and outputs the selected signal as a frequency division signal. A delay means 7 outputs a delay signal obtained by delaying the 1st signal by one period of the input signal. A preset signal generating means 9 selects the delay signal or the 1st signal alternately to preset the programmable frequency divider means by this selected signal.