Patent ID: 7034621

Claim:
An oscillating circuit comprising: a phase comparing circuit which receives a reference signal and a divided signal, and which outputs a pulse signal according to a phase difference between the reference signal and the divided signal; a low pass filter circuit having a frequency passing band, which receives the pulse signal and which outputs an output signal having a first frequency that is within the frequency passing band; a voltage-controlled oscillator which receives the output signal and which outputs an oscillator output signal; and a divider circuit, wherein said divider circuit comprises a plurality of latch circuits which are connected in series such that each of the latch circuits is responsive to said oscillator output signal to latch a data signal which is output from a preceding latch circuit in the series, so that each of the data signals output from the latch circuits has a second frequency that is not in the frequency passing band, and a logic circuit which receives the data signals output from the plurality of latch circuits and which outputs a logic operation signal having the second frequency to a first latch circuit in the series of the plurality of latch circuits, so that the divider circuit only generates signals having the second frequency.