| 摘要 |
A radio device has an antenna for receiving a radio frequency signal, and a radio frequency mixer for down-converting the received radio frequency signal to an intermediate frequency signal. The radio device further has a frequency synthesizer for generating a local oscillator signal for the radio frequency mixer. The frequency synthesizer has a first local oscillator loop for producing a band selective local oscillator signal, a second local oscillator loop for producing a channel selective local oscillator signal, and a local oscillator signal mixer for mixing the band and channel selective local oscillator signals. The band selective local oscillator signal selects a band, and the channel selective local oscillator signal selects a channel within the band. The generated local oscillator signal is an output signal of the local oscillator signal mixer.
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