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Three phase sine wave amplitude control

Discussion in 'Electronic Design' started by PK, Jul 11, 2006.

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  1. PK

    PK Guest

    Hi all, I want to control the amplitude of 3 phase sine wave via
    following option:

    1. With help of PGA(programmable gain amplifiers) with good resolution
    2.with analog switch & resistor network

    I know in both ways it is possible, bt i wanna know in which way it
    will be less costly n provide best resolution of gain.(PGA & analog
    switches both r costly)

    I m generation three phase sine wave by analog Quad DAC...
    kindely suggest any new idea to solve this issue..
  2. Deefoo

    Deefoo Guest

    I have done a similar thing, but I simply implemented the amplitude control
    in the processor because I already had a numeric angle control signal. If
    you have an external angle control signal maybe you can digitize it and feed
    it into your processor (assuming you use some kind of controller).

  3. Tim Wescott

    Tim Wescott Guest

    As Deefoo pointed out, if you're generating your sine wave by a
    processor, why not do the multiply internally?

    Multiplying DACs can be quite inexpensive. With a bit of thinking you
    can make them two-quadrant devices, and have your 'analog switch &
    resistor network' in a package for less than two bucks from Digi-Key.


    Tim Wescott
    Wescott Design Services

    Posting from Google? See

    "Applied Control Theory for Embedded Systems" came out in April.
    See details at

    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
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