Frequency Divider and Multiplier

Discussion in 'General Electronics Chat' started by msseng, Jan 28, 2009.

  1. msseng

    Thread Starter Member

    Jan 19, 2009
    11
    0
    I need a n analog frequency multiplier (x3)
    and then need an analog programmable frequency divider (/N) where N is between 800 and 1000 by step 1.
    Is there any module for this goal?!

    thanks
     
  2. eblc1388

    Senior Member

    Nov 28, 2008
    1,542
    102
    I have not yet built the following frequency multiplier circuit but it works in simulator. It multiplies the input frequency by 3. The source of the original article is here:

    Two-Diode Odd-Order Frequency Multipliers

    [​IMG]
     
  3. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    On what range of input frequencies do you need your divider to work?

    Does the output of the divider need to be sinusodal or can it be a square-wave?

    hgmjr
     
  4. msseng

    Thread Starter Member

    Jan 19, 2009
    11
    0
    The input frequency is less than 2KHz.
    I want to multiple it by 3 and then divide it by N (is between 800 and 1000 with step 1)
    I think it must be a digital input programmable circuit that can divide input frequency, but I need an analog input and out put.
    and I need Sine Wave...
     
    Last edited: Jan 31, 2009
  5. msseng

    Thread Starter Member

    Jan 19, 2009
    11
    0
    Thanks...
    But I don't think it works at very low frequency!!!
     
  6. eblc1388

    Senior Member

    Nov 28, 2008
    1,542
    102
    Sorry we don't have a crystal ball to tel us what frequency you are using.

    Since your other post mentioned about a project on 10MHz, I thought it is a sensible guess to show a circuit working on 10MHz.
     
  7. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Have you thought of PPL frequency multiplication? It is extremely precision, and fairly wide band.
     
  8. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    Bill is right. A PLL can make a stable multiplier over a pretty large frequency range.
    Take a look at the 4046 PLL chip.

    [​IMG]

    When you use a divider of 3 times between the VCO and the phasecomparator, the output of the VCO will be 3 times the input frequency.
    Use comparator 1 , this will also lock on harmonics.

    For the calculations for the resistors and capacitor of the VCO, take a look at this picture.

    [​IMG]

    Greetings,
    Bertus
     
  9. msseng

    Thread Starter Member

    Jan 19, 2009
    11
    0
    You don't need crystal ball, you need open eyes, because I mentioned what you need in post #4!!!
     
  10. msseng

    Thread Starter Member

    Jan 19, 2009
    11
    0
    Thank BERTUS!
    I'll investigate it and say you.
     
  11. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Yes, but his original response, complete with the circuit simulation that you dismissed casually, was on post #2. Try courtesy for those trying to help, or you might find people willing to help in short supply next time. He put time and work into that simulation, and you need to remember we are all volunteers here.
     
  12. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
  13. eblc1388

    Senior Member

    Nov 28, 2008
    1,542
    102
    If you don't understand my comment was referring to your first post, then let's forgot all about it.
     
Loading...