A new concept for direct digital synthesizer (DDS) design is presented in this brief. The originality of the method consists on the use of a traditional modulus 2 L  DDS and a novel modulus (2  L -1) DDS whose outputs are digitally mixed by means of a complex multiplier. This way, the number of different frequencies achievable equals 2 L (2 L -1) using two independent L-bits wide accumulators. No phase truncation is required resulting in extremely low spurs, while the size of the memories for the trigonometric look-up tables is only 2 L  positions. The design has been implemented in a field-programmable gate array to demonstrate its performance and logic requirements
['David Ramírez Morán', 'Javier Gismero Menoyo', 'José Luis Jiménez Martín']
Digital Frequency Synthesizer Based on Two Coprime Moduli DDS