Abstract
The paper deals with the problems of delayed transfer signals in the direct digital synthesizer (DDS) phase accumulator adders. Transfer delay is one of the factors that affect the maximum output frequency of the DDS synthesizer. The main types of adders used in DDS synthesizers are described. Separately, attention was paid to the adder with a consistent transfer of the transfer signal, adders with a transmission carry signal with a fixed block length, adders with a signal transmission delay with a variable block length, and a mathematical analysis of the origin and duration of the delay of the transfer signal in them. It was found that the use of a transfer adder with a variable length of a block in the core of a direct digital synthesizer would increase the maximum output frequency by 2.4 times compared to the adder with a parallel transfer, and by 1.43 times as compared with the adder with a fixed length the block.
Highlights
Direct digital synthesizers (DDS) play an important role in modern radio electronic devices.These are provided with many significant advantages: frequency reordering, high resolution, wide synthesized band of frequencies
The paper deals with the problems of delayed transfer signals in the DDS phase accumulator adders
The main types of adders used in DDS synthesizers are described
Summary
Direct digital synthesizers (DDS) play an important role in modern radio electronic devices. These are provided with many significant advantages: frequency reordering, high resolution, wide synthesized band of frequencies. Multi-level DDS, due to its ability, reliability, possibility of minimization and uniqueness of technical characteristics (continuity of phase during switching from frequency to frequency, the possibility of forming complex signals, digital control of amplitude, frequency and phase of output oscillation) have today been used in systems of communication. The use of DDS in radio engineering information transmission systems with increased stability and security is especially promising. The task of increasing the speed and reliability of computing in direct digital frequency synthesizers can be viewed from two sides. It is the hardware level, the fundamental restrictions on which the technical possibilities of creating an element base—reducing the size of chips, increasing the frequency of synchronization (clock frequency), solving heat dissipation problems, etc
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