direct digital frequency synthesizer
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Author(s):  
Salah Alkurwy ◽  
Sawal H. Ali ◽  
Md. Shabiul Islam ◽  
Faizul Idros

This paper introduces a new technique of designing a read-only memory (ROM) circuit, namely; memory-less ROM as a novel approach to designing the ROM lookup table (LUT) circuit for use in a direct digital frequency synthesizer (DDFS). The proposed DDFS design uses the pipelined phase accumulator (PA) based on the kogge-stone (KS) adder. Verilog HDL programming is encoded on the architecture circuit of pipelined PA and contrasted with other PA based on various adders. The obtained results define the KS adder as having good capabilities for improving the throughput. In addition to the quarter symmetry technique, the built memory-less ROM to obtain the quarter sine amplitude waveform is proposed and implemented in the DDFS system. The implementation of the proposed technique replaces the necessary ROM registers (384 D flip-flops) and multiplexers with simple logic gate circuits instead of traditional ROMs. This technique would reduce the area size and cell count by 56% and 32.6% respectively.


Author(s):  
Soheyl Ziabakhsh ◽  
Sadok Aouini ◽  
Robert G. Gibbins ◽  
Matt Mikkelsen ◽  
Sanam Moslemi-Tabrizi ◽  
...  

Author(s):  
В.И. КОЗЛОВ

Рассмотрена оригинальная упрощенная схема прямого цифрового синтезатора частоты (Direct Digital Synthesizer, DDS). Упрощение состоит в отсутствии довольно громоздкой синусоидальной таблицы при сохранении основных достоинств этого метода синтеза. The original simplified scheme of a direct digital frequency synthesizer (DDS) is considered. The simplification consists in the absence of a rather cumbersome sinusoidal table while preserving the main advantages of this synthesis method.


IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 67581-67590
Author(s):  
Ji-Min Choi ◽  
Dong-Hyun Yoon ◽  
Dong-Kyu Jung ◽  
Kiho Seong ◽  
Jae-Soub Han ◽  
...  

2019 ◽  
Vol 66 (5) ◽  
pp. 1970-1980 ◽  
Author(s):  
Yixiong Yang ◽  
Xin Shi ◽  
Fang Su ◽  
Zhibo Wang ◽  
Pei Yang ◽  
...  

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