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DDS Frequency Generator (Frequency1 Generator) Refer to Figure 10-3. This generator has excellent resolution and allows for frequency sweeping, frequency-shift-keying, and output frequency lists. However, its maximum frequency is the Reference Oscillator frequency divided by 4. Figure 10-3. Generating Waveforms Using a Frequency1 Generator To generate precision frequencies for the memory and output DAC clock, the output of the DDS frequency generator is applied to a DAC. The DAC output is filtered and the resultant clock signals clocks the memory and output DAC to create the waveforms. Divide-by-N Frequency Generator (Frequency2 Generator) Refer to Figure 10-4. This generator has better phase noise characteristics and permits higher frequency operation (up to the Reference Oscillator Frequency). The output of this filter directly clocks the memory and output DAC. Figure 10-4. Generating Waveforms Using a Frequency2 Generator Chapter 10 Block Diagram Description 449
