基于DDS信号技术的信号发生器的设计
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基于DDS信号技术的信号发生器的设计
直接数字式频率合成技术DDS是新一代的频率合成技术，采用数字控制信号的相位增加技术，具有频率分辨率高，频率切换快，频率切换时相位连续和相位噪声低以及全数字化易于集成等优点而被广泛采用。
一． 程序代码
（1） ADDER32B
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity ADDER32B is
port(
ain : in std_logic_vector(31 downto 0);
bin : in std_logic_vector(31 downto 0);
cout: ou
t std_logic_vector(31 downto 0)
);
end;
architecture one of ADDER32B is
begin
cout <= ain + bin;
end;
（2）juxing_rom
LIBRARY ieee;
USE ieee.std_logic_1164.all; LIBRARY altera_mf;
USE altera_mf.all;
ENTITY juxing_rom IS
PORT
(
address : IN STD_LOGIC_VECTOR (11 DOWNTO
0);
clock : IN STD_LOGIC ;
q : OUT STD_LOGIC_VECTOR (7 DOWNTO 0)
);
END juxing_rom;
ARCHITECTURE SYN OF juxing_rom IS
SIGNAL sub_wire0 : STD_LOGIC_VECTOR (7 DOWNTO 0);
COMPONENT altsyncram
GENERIC (
address_aclr_a : STRING;
init_file : STRING;
intended_device_family : STRING;
lpm_hint : STRING;
lpm_type : STRING;
numwords_a : NATURAL;
operation_mode : STRING; outdata_aclr_a : STRING;
outdata_reg_a : STRING;
widthad_a : NATURAL;
width_a : NATURAL;
width_byteena_a : NATURAL
);
PORT (
clock0 : IN STD_LOGIC ;
address_a : IN STD_LOGIC_VECTOR (11 DOWNTO
0);
q_a : OUT STD_LOGIC_VECTOR (7 DOWNTO 0)
);
END COMPONENT;
BEGIN
q <= sub_wire0(7 DOWNTO 0);
altsyncram_component : altsyncram
GENERIC MAP (
address_aclr_a => "NONE",
init_file => "../MIF/juxing.mif",
intended_device_family => "Cyclone",
lpm_hint => "ENABLE_RUNTIME_MOD=NO",
lpm_type => "altsyncram", numwords_a => 4096,
operation_mode => "ROM",
outdata_aclr_a => "NONE",
outdata_reg_a => "CLOCK0",
widthad_a => 12,
width_a => 8,
width_byteena_a => 1
)
PORT MAP (
clock0 => clock,
address_a => address,
q_a => sub_wire0
);
END SYN;
（3）mux3_1
library ieee;
use ieee.std_logic_1164.all;
entity mux3_1 is
port( sin:in std_logic_vector(7 downto 0);
sanjiao,juxing:in std_logic_vector(7 downto 0);
a,b:in std_logic;
cout:out std_logic_vector(7 downto 0) );
end mux3_1;
architecture behavior of mux3_1 is
signal addr:std_logic_vector(1 downto 0);
begin
process(a,b)
begin
addr(0)<=a;
addr(1)<=b;
case addr is
when "00" => cout<=sin;
when "01" => cout<=sanjiao;
when "10" => cout<=juxing;
when others => null;
end case;
end process;
end behavior;
（4）sanjiao_rom
LIBRARY ieee;
USE ieee.std_logic_1164.all;
LIBRARY altera_mf;
USE altera_mf.all; ENTITY sanjiao_rom IS
PORT
(
address : IN STD_LOGIC_VECTOR (11 DOWNTO
0);
clock : IN STD_LOGIC ;
q : OUT STD_LOGIC_VECTOR (7 DOWNTO 0)
);
END sanjiao_rom;
ARCHITECTURE SYN OF sanjiao_rom IS
SIGNAL sub_wire0 : STD_LOGIC_VECTOR (7 DOWNTO 0);
COMPONENT altsyncram
GENERIC (
address_aclr_a : STRING;
init_file : STRING;
intended_device_family : STRING;
lpm_hint : STRING;
lpm_type : STRING;
numwords_a : NATURAL;
operation_mode : STRING;
outdata_aclr_a : STRING;
outdata_reg_a : STRING; widthad_a : NATURAL;
width_a : NATURAL;
width_byteena_a : NATURAL
);
PORT (
clock0 : IN STD_LOGIC ;
address_a : IN STD_LOGIC_VECTOR (11 DOWNTO
0);
q_a : OUT STD_LOGIC_VECTOR (7 DOWNTO 0)
);
END COMPONENT;
BEGIN
q <= sub_wire0(7 DOWNTO 0);
altsyncram_component : altsyncram
GENERIC MAP (
address_aclr_a => "NONE",
init_file => "../MIF/sanjiao.mif",
intended_device_family => "Cyclone",
lpm_hint => "ENABLE_RUNTIME_MOD=NO",
lpm_type => "altsyncram",
numwords_a => 4096,
operation_mode => "ROM", outdata_aclr_a => "NONE",
outdata_reg_a => "CLOCK0",
widthad_a => 12,
width_a => 8,
width_byteena_a => 1
)
PORT MAP (
clock0 => clock,
address_a => address,
q_a => sub_wire0
);
END SYN;
（5）sinx256_rom
LIBRARY ieee;
USE ieee.std_logic_1164.all;
LIBRARY altera_mf;
USE altera_mf.all;
ENTITY sinx256_rom IS
PORT
(
address : IN STD_LOGIC_VECTOR (7 DOWNTO 0);
inclock : IN STD_LOGIC ;
