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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..
    regards,
    pravin
     
  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).

    --DF
     
  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
    http://www.wescottdesign.com

    Posting from Google? See http://cfaj.freeshell.org/google/

    "Applied Control Theory for Embedded Systems" came out in April.
    See details at http://www.wescottdesign.com/actfes/actfes.html
     
  4. http://www.tinaja.com/magsn01.asp


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    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
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