Patent ID: 7515647
Filing Date: 2009-04-07
Classification: H03C

Abstract:
1. A digital frequency converter comprising: a modulated-signal converter for converting an inputted modulated signal into phase information and amplitude information of a polar coordinate type, the modulated-signal converter outputting the phase information and the amplitude information; a phase calculation means for accumulatively adding phase data according to a desired conversion frequency; a phase converter for adding/subtracting an output signal of the phase calculation means to/from the phase information outputted from the modulated-signal converter, thereby generating phase information to be obtained when frequency conversion for the modulated signal is executed, the phase converter further outputting the phase information; a sampling frequency converter for converting a sampling frequency of the phase information outputted from the phase converter, the sampling frequency converter further outputting the phase information; and a phase-modulated signal generator for generating a phase-modulated signal on the basis of the phase information outputted from the sampling frequency converter, wherein the digital frequency converter outputs the phase information and the amplitude information.