Frequency Doubler

Discussion in 'The Projects Forum' started by karunanithi_pricol, Mar 13, 2006.

  1. karunanithi_pricol

    Thread Starter Member

    Mar 13, 2006
    Hi Everyone
    I am in the process of designing a Frequency doubler circuit inwhich the frequency input will come from Hall sensor; I have to picked the sensor and doubles the the input frequency.

    * Input frequency will be in the range of 0 to 100Hz.

    Can anyone suggest me a cost effective solution for the my requirement?

  2. mozikluv

    AAC Fanatic!

    Jan 22, 2004


    i would suggest diodes but you have to choose w/c one would you prefer.

    the ordinary fast switching diode would do, also a fast recovery junction diode & ultra fast, likewise a schotty barrier or a varactor.

    but for me the best choice would be the schotty barrier due to its low flicker noise in addition to its low barrier potential.

    for ultra fast switching speed i can recommend the FD700. it switches at 0.7ns and a junction capacity of 1pf, it can handle up to 250ma with a reverse voltage of 30v.

    for fullwave rectification, a varactor will do it for you becoz it has a high conversion efficiency and has an odd harmonics rejection. and finally filtering is easy.

  3. pebe

    AAC Fanatic!

    Oct 11, 2004
    Can you explain a little more about the input frequency.
    Is it a 50:50 square wave?
    At what amplitude?
    Does it vary between 0 and 100Hz?
    Why do you want to double the frequency?
  4. karunanithi_pricol

    Thread Starter Member

    Mar 13, 2006
    Hi mozikluv
    Thanks for your response, but i am not sure what configuration you are talking about!

    Hall sensor output will be a square pulse

    Can you post a schematic for this circuit?