High Frequency Full Wave Rectifier

Discussion in 'Homework Help' started by Simardeep Singh, Oct 27, 2015.

  1. Simardeep Singh

    Thread Starter New Member

    Oct 27, 2015
    1
    0
    Good afternoon,

    I am assigned a simple project for my course and I would appreciate some guidance in what steps should I take.

    The task is to design a precision full wave rectifier, where the input is a sine wave with a frequency range of 1kHz to 1MHz also with an amplitude of 500mV and 5V. The distortion in output waveform should be minimal.

    Currently, I am doing research on designs from different manufacturers and a lot of them depend of low frequency range. If anyone can help a junior out, I would appreciate it.

    Thank you
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,056
    3,245
    Look up "precision rectifier" using op amps.
    For 1 MHz you will need a high-speed op amp. The old 741 won't cut it.
    Also any diodes should be high speed Schottky types.
     
  3. #12

    Expert

    Nov 30, 2010
    16,346
    6,835
    A very short search of vendor sites shows that there are plenty of op-amps fast enough to do this job.:)
    The first one I found costs $108, but that was a very low quality search I did.:oops:
    More time spent searching should surely find a better price.;)
     
  4. dl324

    Distinguished Member

    Mar 30, 2015
    3,250
    626
    Somewhere on the web there's a neat precision full wave rectifier that uses 2 single supply opamps and no diodes. Designed by a couple Spanish students IIRC...

    I'd post a schematic, but this is homework.:rolleyes:
     
    Last edited: Oct 28, 2015
  5. crutschow

    Expert

    Mar 14, 2008
    13,056
    3,245
    You will find that getting to 1 MHz with a precision rectifier is not a trivial task, even with a high frequency op amp.
     
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