| 摘要 |
A digital frequency synthesizer and a method thereof are provided. In the digital frequency synthesizer, a plurality of multiphase signals (MPSs) is generated by a phase delay locked loop array, and a transition reference values is generated by a programmable transition value generator. An operation result obtained according to an input signal and an accumulated value is compared with the transition reference values to generate a phase selection control signal. A phase signal is selected among the MPSs according to the phase selection control signal. After that, a sampling control is performed to the selected phase signal to generate a synthetic signal. The digital frequency synthesizer and the method thereof are flexible and are easy to produce tiny analytic phase, thus, not only fine tuning phases is added but also the resolution of the synthetic signal is improved.
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