Hi. If i generate a sine wave signal(Full Scale - 24bit - 5Vpp) using the altera NCO, how to generate a 0.8902 Vpp sine wave?
Thanks
sine wave: how to set amplitude?
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sine wave: how to set amplitude?
by jasonkee » Mon Nov 30, 2009 3:26 am
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by bluemind » Mon Nov 30, 2009 10:10 am
Divide it with a OpAmp with .8902/5 amplification.
But thats not what you want to hear.
You can divide the 24bit signal, by 5/.8902. guessing the DAC ore what you are going to do with the sine wave is linearly, it will do the trick.
But thats not what you want to hear.
You can divide the 24bit signal, by 5/.8902. guessing the DAC ore what you are going to do with the sine wave is linearly, it will do the trick.
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by WadeH » Mon Nov 30, 2009 5:36 pm
Easiest would be to run your 24-bit value through a 24x24=48bit multiplier with the other input set = 0xCADE66, or 2^24*.89025. The upper 24-bits of the output would be sent to a DAC with a range (reference voltage) of 1 volt.
As long as we're assuming that you reconstruct the sine-wave with a DAC, you could modulate the reconstruction-DAC's reference voltage with another DAC. This would require another DAC (maybe another section of a multiple-output DAC, if each had its own Vref.)
Wade Hassler
As long as we're assuming that you reconstruct the sine-wave with a DAC, you could modulate the reconstruction-DAC's reference voltage with another DAC. This would require another DAC (maybe another section of a multiple-output DAC, if each had its own Vref.)
Wade Hassler
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