90 Degree Phase shifted square wave

Discussion in 'General Electronics Chat' started by Amol Sakhale, Jun 17, 2015.

  1. Amol Sakhale

    Thread Starter New Member

    Jun 12, 2015
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    I want to make one circuit in which i need to vary the frequency with voltage and also have to produce 90 degree phase shifted same square pulse.
    That phase shifted pulse must also change it's frequency with first wave's frequency.
    Not getting how to do exactly.
    Thanks :)
     
  2. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
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  3. Amol Sakhale

    Thread Starter New Member

    Jun 12, 2015
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    Frequency range 1-10KHz and voltage level 0 - 15V
    Thanks :)
     
  4. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
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    If the linked project meets your requirement, it would be easy to raise the 5V voltage level output from the PIC to 15V by using a couple of general purpose transistors.
    [you would obviously require a 15V power supply]
     
  5. crutschow

    Expert

    Mar 14, 2008
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    You start by generating a double-frequency 50% duty-cycle square-wave.
    Have one toggle flip-flip trigger off the rising edge.
    Have a second toggle flip-flop trigger off the trailing edge.
    The output from the two flip-flops is two signals at the desired frequency with a 90° shift between them.
     
    KLillie and Ramussons like this.
  6. Amol Sakhale

    Thread Starter New Member

    Jun 12, 2015
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    Thank you very much for your concern :)
    It will be better if that circuit will not based on any micro-controller and will consist of normal opams, transistors and some ICs.
     
  7. Amol Sakhale

    Thread Starter New Member

    Jun 12, 2015
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    In case of using Flipflops, I will not need any micro controller for any other thing right ?
     
  8. crutschow

    Expert

    Mar 14, 2008
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    Correct. You just need a square-wave generator, flip-flops, and an inverting gate to invert the clock to the second FF.
     
  9. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
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    Do you mean a voltage controlled pulse generator.?
     
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