high frequency integrator

Discussion in 'The Projects Forum' started by eng.hamoud, Jan 6, 2012.

  1. eng.hamoud

    Thread Starter New Member

    Jan 6, 2012
    2
    0
    hello every body,

    i have a project to make a function generator using 555 timer

    i'am using the 555 timer as astable multivibrator to produce a square waves then passing it to an integrator to convert it to triangle wave then i used another integrator to produce a sine wave ,,,

    the function generator must oscillates at 1 Hz - 1 MHz
    in low frequencies it is simple to produce the integrator output

    my problem now is at high frequencies such 1MHz how to integrate!!!

    any ideas ???? i want to do it as fast as i can

    thanx everybody
     
  2. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    Usea crystal as a clock source for a counter circuit, use the outputs of the counter through an op amp integrator/buffer and another to set output impedance to 50Ω.
     
  3. eng.hamoud

    Thread Starter New Member

    Jan 6, 2012
    2
    0
    where is the 555 timer??!!
     
  4. crutschow

    Expert

    Mar 14, 2008
    12,995
    3,229
    You might look up "Miller integrator". It can be made with one or more transistors which should be fast enough for your requirements.

    Edit: The problem with an integrator is that its output amplitude is inversely proportional to frequency. How will you deal with that?

    It would be much easier if you could use a function generator chip such as the XR2206 which generates square, sine, ramp, and triangular waveforms.
     
    Last edited: Jan 8, 2012
  5. crutschow

    Expert

    Mar 14, 2008
    12,995
    3,229
    Deleted post.
     
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