Patent ID: 8593131

Claim:
A signal generation circuit comprising: a first signal source that generates a first signal; and a variable rate frequency divider section that generates a variable rate frequency-divided signal in which a first frequency-divided signal obtained by frequency-dividing the first signal by a first frequency dividing ratio and a second frequency-divided signal obtained by frequency-dividing the first signal by a second frequency dividing ratio temporally alternately appear in a specified mixing ratio, the variable rate frequency divider section being structured to generate the variable rate frequency-divided signal through repeating: step 1 adding a first constant indicating a ratio of the first frequency-divided signal included in the variable rate frequency-divided signal to a first variable; step 2-1, when the first variable after the addition becomes greater than or equal to a result of addition of the first constant and a second constant indicating a ratio of the second frequency-divided signal included in the variable rate frequency-divided signal, outputting the first frequency-divided signal, subtracting the first constant and the second constant from the first variable, and returning to step 1); and step 2-2, when the first variable after the addition becomes smaller than a result of addition of the first constant and the second constant, outputting the second frequency-divided signal and returning to step 1.