PWM to 0-10v output

Discussion in 'General Electronics Chat' started by riyashini, May 28, 2015.

  1. riyashini

    Thread Starter New Member

    Sep 18, 2014
    20
    0
    Hi all

    I want to convert the 1.5 to 4v PWM signal to 0-10V output..how can i convert this using opamp?
    Can anyone guide me to convert this?
     
  2. DickCappels

    Moderator

    Aug 21, 2008
    2,659
    632
    Is the 1.5V to 4V a variable amplitude PWM signal, or is it a PWM signal that switches between 1.5V to 4V (low = 1.5V, high = 4V)? Or something else entirely?
     
  3. riyashini

    Thread Starter New Member

    Sep 18, 2014
    20
    0
    thanks for your reply.
    its a variable amplitude pwm signal
     
  4. DickCappels

    Moderator

    Aug 21, 2008
    2,659
    632
    By another name, a pulse height-width multiplier.

    You could make a peak detector (opamp and diode) and follow it with a direct coupled amplifier with a gain of 4 [which is = 10/(4-1.5)] and add an offset of (left as an exercise).


    [​IMG]
    The output of the second opamp would then be uses as the power supply for a CMOS buffer. The pulse into the buffer would have to come from some sort of level shifter. If the frequency is not too fast you can probably use a small MOSFET (2N7000) or bipolar (2N3904) with a grounded source/emitter and a pull-up resistor on the collector, which pulls up to the VDD of the buffer (output of second opamp).

    There is no doubt a more elegant solution, but this can get you started.
     
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