VHDL implementation of a direct digital synthesizer for various applications
Publication Date : 17/04/2016
A frequency synthesizer is an electronic device which generates a range of frequency mostly sine wave from a fixed clock provided. These frequency synthesizers are commonly found in radio receivers, mobile telephones radio telephones, wacky talkies, as local oscillators, satellite receivers, GPS system. Direct digital synthesizer (DDS) is a frequency synthesizer which digitally creates arbitrary wave forms of different frequencies from the fixed frequency provided as clock input. DDS generates digital wave forms and these digital waveforms are converted to analog signals by the digital to analog converter connected at the output of DDS. The DDS designed here is a ROM based DDS. DDS has many advantages over PLL and other similar approaches such as fast settling time, sub-hertz frequency resolution, continuous phase switching response and low phase noise. This system has many applications such as the confidential message transfer, speedy frequency switching.
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