| 摘要 |
A direct digital synthesizer for generating an output signal within a frequency band. The direct digital synthesizer comprises an input section (110) for receiving a phase differential value and generating a phase angle value. A phase-amplitude converter (120) generates an amplitude value in response to the phase angle value. A band-shaped dither generator (160) generates a dither value. A first combiner (141, 141) sums the amplitude value and the dither value to define a first combined value. A second combiner (142, 142) differences the amplitude value and the dither value to define a second combined value. A first digital-to-analog converter (DAC) (148, 148) converts the first combined value to a first analog signal. A Second digital-to-analog converter (DAC) (149, 149) converts the second combined value to a second analog signal. An output combiner (150, 150) combines the first analog signal and the second analog signal to generate the output signal. |
