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Recent content by kishore3677

  1. K

    [SOLVED] pulse width modulation linearity

    Hi FvM, One interesting observation. I used multisim, used AD711 op-amp as comparator. Fed Tri and DC voltage to inputs and measured output widths in virtual scope. The widths are not proportional. This is amazing. All non linearities are ruled out in simulation, but the results are shocking. gvk
  2. K

    [SOLVED] pulse width modulation linearity

    Hi FvM, So what is your conclusion. Where things are leading to? gvk
  3. K

    [SOLVED] pulse width modulation linearity

    Hi FvM, Here are the data points captured: VIN(V) VOUT(width in us) 0 500 ( for 1 KHz) 1 450 2 400 3 345 4 293 5 243 6 193 7 143 8 92 9 41 any clues? regards gvk
  4. K

    [SOLVED] pulse width modulation linearity

    Hi FvM, What I am looking for is that I want to prove that my pulse width changes proportionally to my input DC voltage and that should be linear. for example , 1 V DC input results in 200 us pulse width(say),then 2V input should result in 400us and so-on. My tri wave frequency is 1KHz...
  5. K

    [SOLVED] pulse width modulation linearity

    My supply voltages are +/- 12V. I did plot the graph between Input DC voltage and output pulse width measured value and the equation of the graph is order 2. Same is the case with Duty cycle. Now can I use a DDS chip ? will it give me high accuracy triangle wave?
  6. K

    [SOLVED] pulse width modulation linearity

    Would you suggest some ICs which gives highly linear PWM output for input DC Range of 0- 10V?
  7. K

    [SOLVED] pulse width modulation linearity

    Please find the attached circuit for your reference gvk
  8. K

    [SOLVED] pulse width modulation linearity

    Hi, To measure PWM linearity, I was just measuring the width in oscilloscope. I was expecting a proportional change in width with respect to a DC voltage. My VIN goes upto 8V. My triangular peak is at 9V. By seeing all your answers, I am still unclear as how to make Pulse width linear to DC...
  9. K

    [SOLVED] pulse width modulation linearity

    Hi, Thanks a lot. But I have checked everything, I am using a agilent wave generator. DC precision source and comparators bypassed with decoups. But there is still a problem. Have you done anything like this before or would you give any suggestions to improve. Also are you sure you would get...
  10. K

    [SOLVED] pulse width modulation linearity

    Hello, need some help. I was trying linear PWM with a comparator(AD790) using a triangle wave and DC voltage. To my surprise, PWM output duty cycle is not linear when DC voltage changes. Any suggestions.. gvk
  11. K

    Sinusoidal PWM with comparator

    Hi Vimal, I just wanted to know if there is a mathematical way of expressing pulse width as a difference of triangle and sine wave input.
  12. K

    Sinusoidal PWM with comparator

    Hi naveen Ya, it was a nice link. But I have one question. The carrier frequency is given in the range 2K-15Khz, now what to choose? why?
  13. K

    Sinusoidal PWM with comparator

    Hi, I was trying PWM by giving a sine wave and triangle wave in a comparator. Could anybody explain what should be the frequency of triangle and sine wave? and Why?
  14. K

    Integerator Reset Circuit

  15. K

    Integerator Reset Circuit

    Hi FvM, I tried to wire integrator circuit with and without resistance and I found that with resistance, the circuit works fine(about 1K) and resistor less than 500 ohms, my output goes to zero even with base open. Without resistance, the output is always zero. Could you explain that...
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