Patent ID: 7702052

Claim:
A radio-frequency receiver comprising: two radio-frequency receiving sections for receiving digital broadcasting signals including: a first input terminal for receiving a digital broadcasting signal; a second input terminal for receiving a digital broadcasting signal; a first mixer whose one input receives a signal from the first input terminal; a second mixer whose one input receives a signal from the second input terminal; a first output terminal for receiving an output signal from the first mixer; a second output terminal for receiving an output signal from the second mixer; a PLL controller; a plurality of low-voltage-driven oscillation circuits that is connected to the PLL controller and oscillates at a frequency higher than the digital broadcasting signal under control of the PLL controller; a first selective switching circuit which is connected to outputs of the plurality of oscillation circuits and to the PLL controller for controlling, and has a first terminal and a second terminal; a first frequency-divider section connected to the first terminal and another input of the first mixer; and a second frequency-divider section connected to the second terminal and another input of the second mixer, wherein, any of the oscillation circuits are connected to the first terminal and the second terminal, and frequency-dividing rates of the first frequency-divider section and the second frequency-divider section are respectively varied by controlling the first selective switching circuit at the PLL controller.