Abstract
A simple method to digitally produce a sine wave-form with constant amplitude over a relatively wide band of frequencies is described. The method is based on the generation of a number of samples per cycle of the sine wave-form, using an up/down counter and a decoder, and then processing these samples in a summing amplifier and in a controlled-gain amplifier to produce a staircase approximation of the sinewave. The total harmonic distortion of the resulting waveform can be reduced substantially by inserting a low-pass filter.
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