Verilog implements DDS waveform generator module, which can realize adjustable frequency and phase, three waveforms

Design implementation verilog DDS Implementation and simulation , Design a complete DDS Waveform generator module , Frequency can be realized 、 Phase adjustable , Three waveforms .

Digital frequency synthesizer （Direct Digital Synthesizer） It is a frequency synthesis technology that directly synthesizes the required waveform from the phase concept . A direct digital frequency synthesizer consists of a phase accumulator 、 adder 、 Waveform storage ROM、D/A Converter and low pass filter （LPF） constitute .DDS The principle block diagram of is shown in the figure 1.2 Shown ：

chart 1.2 DDS Principle block diagram

stay vivado On 、 Simulation , The screenshot is as follows ：

verilog The complete code module is designed as follows ：

module ddschoose(in1,in2,in3,clk,nRest,cos_o,n,pha_w);
input [9:0] in1,in2,in3;
input clk,nRest,n,pha_w;
output [9:0] cos_o;
reg [9:0] cos_o;
reg [14:0] count;

initial//???
begin
count=0;
end

[email protected](posedge clk)
begin
if(!nRest)
count=0;
el