| 摘要 |
An RF (radio frequency) synthesizer (200) includes a VCO (voltage controlled oscillator) (220) operable to provide an output signal at a desired frequency (FVCO) and, coupled to the VCO, a frequency divider operable to receive the output signal of the VCO and to provide an output signal which is divided in frequency relative to the output signal of the VCO, wherein the synthesizer includes an output path (250, 251) which includes the frequency divider (241), whereby the synthesizer is operable to provide an output signal at an output frequency (FVCO/Nx) of the frequency divider. The synthesizer may beneficially include an integrated circuit which incorporates at least part of the VCO. Also described is an RF transmitter or receiver, e.g. for use in a base transceiver station of a mobile communications system, which incorporates the synthesizer. |
