Patent ID: 7912112

Claim:
A spectrum spreading circuit, comprising: a control portion that repeats a sequence in which the control portion generates a designation signal for designating all of four or more frequencies by selecting, from the frequencies, a next frequency which has not yet been selected during the sequence; and a signal generating portion that sequentially generates output signals having the designated frequencies respectively on the basis of the designation signal, wherein a highest frequency or a lowest frequency in the four or more frequencies is defined as a first frequency, a frequency adjacent to the first frequency is defined as a second frequency, and a frequency, which is adjacent to the second frequency and is other than the first frequency, is defined as a third frequency, and wherein the control portion is configured such that: if the third frequency is first selected among the first to third frequencies, the control portion selects the first frequency next, then selects the second frequency, and thereafter selects every other frequency sequentially in ascending or descending order of the frequencies, and if the second frequency is first selected among the first to third frequencies, the control portion selects the first frequency next, then selects the third frequency, and thereafter selects every other frequency sequentially in ascending or descending order of the frequencies.