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hpola3
Beginner
195 Views

50/60Hz Digital PLL

We want to implement a digital 50/60Hz PLL for synchronisation purpose.

We want to replace an old HEF4046B IC.

Is it possible to design a 50/60Hz with FPGA/CPLD (MAX10 family i.e)? do you have any reference design?

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5 Replies
Rahul_S_Intel1
Employee
91 Views

Hi ,

You can use PLL for the generation

Rahul_S_Intel1
Employee
91 Views

Hi ,

Kindly let me know , if you need further assistance.

 

Regards,

Rahul S

hpola3
Beginner
91 Views

Hi Rahus,

 

In Max10 internal PLLs minimum frequency range is in MHz range.

I need a PLL for 50/60Hz application (grid frequency lock). Also PLLs has a filter which adjust its slew rate and speed.

Do you think is it possible with Max10 family? Do you have an IP of reference design for such application?

Rahul_S_Intel1
Employee
91 Views

Hi ,

May I know the below suggestion will work or not .

Implement a counter , where you know the input frequency and make the counter to your desired clock out put . I find my code may be it will be useful for you .

 

library IEEE;

use IEEE.NUMERIC_STD.all;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;

 

entity scale_clock is

 port (

  clk_50Mhz : in std_logic;

  rst    : in std_logic;

  clk_2Hz  : out std_logic

);

end scale_clock;

 

architecture Behavioral of scale_clock is

 

 signal prescaler : unsigned(23 downto 0);

 signal clk_2Hz_i : std_logic;

begin

 

 gen_clk : process (clk_50Mhz, rst)

 begin -- process gen_clk

  if rst = '1' then

   clk_2Hz_i  <= '0';

   prescaler  <= (others => '0');

  elsif rising_edge(clk_50Mhz) then  -- rising clock edge

   if prescaler = X"BEBC20" then   -- 12 500 000 in hex

    prescaler  <= (others => '0');

    clk_2Hz_i  <= not clk_2Hz_i;

   else

    prescaler <= prescaler + "1";

   end if;

end if;

 end process gen_clk;

 

clk_2Hz <= clk_2Hz_i;

 

end Behavioral;

 

Rahul_S_Intel1
Employee
91 Views

Hi ,

Kindly let me know if you need further assistance

Reply