A direct digital synthesizer of frequency with phase quantization in the system of residual classes

The paper considers principles of design and functioning of a direct digital synthesizer of frequency in the system of residual classes. In order to lower the level of spurious components in the output signal, the synthesizer has a decreased number of controlled phase-shifters, which is possible due to quantization of instantaneous phase of the synthesized harmonic oscillation. The paper includes a description of phase quantization in the code of the system of residual classes. The spectra of synthesizers with and without phase quantization are compared