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Sine Wave from Square wave

Discussion in 'General Electronics Discussion' started by vinit2100, Nov 12, 2014.

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  1. vinit2100

    vinit2100

    100
    1
    Oct 21, 2013
    Hi,
    I want to generate a sine wave from LTC6900 which gives a square wave output. Please help me designing.
     

    Attached Files:

  2. davenn

    davenn Moderator

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    1,870
    Sep 5, 2009
  3. vinit2100

    vinit2100

    100
    1
    Oct 21, 2013
    That is a Tuned Band Pass Filter IC UAF42. I cant afford that IC . It costs around 15$. any other alternative for this ?
     
  4. LvW

    LvW

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    145
    Apr 12, 2014
    If the frequency is fixed you could use a self-designed lowpass or bandpass filter (the necessary order is determined by your distortion requirements: Quality of the sinus signal).
    However, a filter that can be tuned together with the varying frequency of the squarewave is harder to realize.
     
  5. vinit2100

    vinit2100

    100
    1
    Oct 21, 2013
    ok then how will i design a filter ?
     
  6. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,268
    Nov 28, 2011
    How about answering some questions first.

    Will the frequency of your square wave be variable?

    What is the frequency range?

    How quickly will the frequency change? Can you tolerate some distortion while the filter settles to a new frequency?

    What is your budget?
     
  7. vinit2100

    vinit2100

    100
    1
    Oct 21, 2013
    Using LTC6900 we can set the output frequency . I will set that frequency to around 2khz. Budget in a sense means, I can afford huge cost IC
     
  8. LvW

    LvW

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    145
    Apr 12, 2014
    There are many, many introductory articles accessible through the Internet which can teach you filter design basics. I don`t think that it is possible to do that in a forum like this.
     
  9. vinit2100

    vinit2100

    100
    1
    Oct 21, 2013
    ok. l will do and come with my results
     
  10. BobK

    BobK

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    Jan 5, 2010
    If you need only a fixed frequency, why not make an oscillator that produces a sine wave instead? It is easier to convert a sine to a square wave than what you are trying to do.

    Bob
     
  11. dablakh0l

    dablakh0l

    11
    1
    Sep 19, 2014
    Or build a cheap sine wave generator from an op-amp and some r's and c's
     
  12. vinit2100

    vinit2100

    100
    1
    Oct 21, 2013
    Ok lets make a oscillator circuit. But my requirement is i don't need the sine waves always. How will i control the oscillator then ? I want to turn ON/OFF oscillator !!!
     
  13. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    With a switch?

    Why don't you tell us what you are trying to do.

    Bob
     
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