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