| 摘要 |
A digital frequency converter is provided that maintains a high power efficiency in an EER scheme despite the inclusion of digital signal processing. An inputted modulated signal is converted into phase information and amplitude information of a polar coordinate type. The amplitude information is outputted as amplitude information of the digital frequency converter. Meanwhile, phase change of a frequency f 2, which is outputted from an accumulator, corresponding to lower 'Q' figures of phase data PD for frequency conversion is added to the phase information by an adder. In addition, a sampling frequency of the phase information outputted from the adder is upsampled by an interpolator, and also, phase change of a frequency f 3, is converted into a phase-modulated signal of an orthogonal coordinate type, and then outputted as phase information of the digital frequency converter.
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