Implementation of Digital Frequency Synthesizer in Communication System on FPGA

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Provided by: International Journal of Engineering Trends and Technology
Topic: Hardware
Format: PDF
Digital Frequency Synthesizer (DFS) is used in communication system to generate a sampled sinusoidal carrier wave. The major advantages of DFS method is that precisely and rapidly manipulate its output frequency, phase and amplitude under the control of a DSP compare to CO-ordinate Rotation DIgital Computer (CORDIC) technique, which uses an iterative computation method to generate carrier frequency. But, circuit complexity and distortions will be generated, when memory compression methods are employed in CORDIC and also ROM size becomes fairly large as it grows exponentially with the width of the phase accumulator whereas a large phase accumulator width is desirable in order to achieve fine frequency tuning.
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