Example 2 (DDS Requiring Negative Frequencies) - Example 2 (DDS Requiring Negative Frequencies) - 6.0 English - PG141

In standard mode, with a single-channel DDS, a 100 MHz system clock, and a frequency resolution of 1 Hz, the phase width is 25 bits. Frequencies of -3 MHz, -1 MHz, 1 MHz, and 3 MHz are required. F_s is the frequency per channel, which is system clock/number of channels: that is, 25 MHz. The negative frequencies alias to every F_s Hz. The legal range to enter in the user interface is 0 to F_s, so the entered frequencies for this example must be 22 MHz (F_s-3 MHz), 24 MHz (F_s-1 MHz), 1 MHz, and 3 MHz respectively.