SINE WAVE GENERATION CIRCUIT AND TEST DEVICE
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United States of America
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Jan 16, 2025
app pub date -
Jul 9, 2024
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Jul 9, 2024
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Abstract
A sine wave generation circuit includes: a first direct digital synthesizer generating a digital sine wave fundamental signal having a frequency f0 in a normal operation mode and a calibration mode; a second direct digital synthesizer generating a digital second harmonic correction signal having a frequency 2f0 in the normal operation mode; a correction circuit superimposing the digital second harmonic correction signal on the digital sine wave fundamental signal; a D/A converter converting an output of the correction circuit into an analog sine wave signal; an output buffer receiving the analog sine wave signal and outputting an analog sine wave output signal; an A/D converter converting the analog sine wave output signal into a digital signal in the calibration mode; and a processing circuit generating a spectrum based on the digital signal in the calibration mode and setting a parameter of the second direct digital synthesizer based on the spectrum.
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