A ROM-less direct digital frequency synthesizer by using trigonometric quadruple angle formula
Chua‐Chin Wang, Hsien-Chih She, Ron Hu · 2003
A ROM-less direct digital frequency synthesizer (DDFS) employing a trigonometric quadruple angle formula is presented. The spectral purity is better than -130 dBc worst case spur. The resolution is up to 13 bits. Neither any scaling table nor error correction table is required. The maximum error is mathematically analyzed. The word length of each multiplier is carefully selected in the digital implementation such that the error range is limited and the resolution is preserved.