DDS (Direct Digital Synthesis) generators
Basic principle:
DDS function generators generate periodic signals precise frequencies choosing samples the memory
rather than producing all the samples signal. can generate varied
characteristic waveforms order test the operation electronic systems, from very low frequencies just a
few mHz MHz more. possible modify the frequency without phase
discontinuity.
Architecture DDS function generator
It important note that signal generation with the DDS method differs significantly from the method used an
arbitrary signal generator.GENERATORS
Theoretical Introduction:
Introduction domaine Generator
Function generators are among the most widely-used test and measurement instruments.
For arbitrary signal generation, each sample the signal period built and stored the memory generated
sequentially. This technique offers exceptional accuracy and stability, high
spectral purity, low noise and excellent frequency agility.
For signals generated with DDS technology, single signal period stored the memory, but only certain samples
are generated create the waveform and the required frequency, shown the illustration below:
Generation MHz signal
by Direct Digital Synthesis (DDS)
umlmx-
.
It allows users adjust the amplitude these signals more, possibly with the presence DC
component.
In addition, they may also provide modulations specific functions
