| 摘要 |
<p>A direct digital synthesizer capable of generating a desired frequency with small circuitry, low power consumption, and no spurious components. It includes an accumulator (1) for accumulating a frequency control word (K) for each pulse of a clock signal, a D/A converter (2) for converting the accumulation value of the accumulator to an analog voltage, an integrator (3) for smoothing the output of the D/A converter, a comparator for comparing the output of the integrator with a reference voltage (Vr), and for producing pulses at timings at which the output of the integrator reaches the reference voltage while the accumulation value of the accumulator is increasing, and a pulse generator (5) for producing pulses in synchronism with the rising edges of the output of the comparator. The output pulses of the pulse generator constitute an output of the direct digital synthesizer. <IMAGE></p> |
