Direct digital synthesizer, reference frequency generating device, and sine wave outputting method
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United States of America Patent
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Jul 28, 2015
Grant Date -
Dec 11, 2014
app pub date -
Dec 10, 2012
filing date -
Dec 19, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A DDS achieved in size and cost reductions by removing a ROM for storing a table and the like and suppressing an operation amount is provided. A DDS includes an NCO, a DAC, and a BPF. The NCO outputs a sawtooth wave. The DAC converts either one of the sawtooth wave outputted from the NCO and a triangle wave signal converted by a waveform converting circuit based on the sawtooth wave, from a digital signal into an analog signal. The BPF receives the signal converted into the analog signal by the DAC and extracts a sine wave at a predetermined frequency from the inputted signal, by allowing a signal at a frequency within a fixed range to pass therethrough.
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