Developing the ac low voltage standard source need the technology of low-noise digital synthesis sine wave. In this
article, we analysed the frequency spectrum characteristic of the digital synthesis sine wave. Considering the ac low
voltage had the strict requirement for harmonic wave, we put forward the "harmonic wave counteraction method", and
found this function to counteract harmonic wave, and made it come true from the mathematics and electrocircuit. By the
strict calculating of the numerical value and testing verification, we testified the feasibility of the method. By using
"harmonic wave counteraction method ", every harmonic wave noise was reduced several order of magnitude, and the
total noise voltage was less than 4μV in the 50Hz~10kHz frequency range, the uncertainty for the effective value of
output voltage was 0.001%.
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