| 摘要 |
<p>PURPOSE:To reduce the radiation level of a higher harmonic of a clock signal by applying a modulation to the clock signal generated from a clock circuit. CONSTITUTION:The circuit is provided with a modulating circuit 7 for modulating an oscillation frequency of a first oscillating circuit 1 for generating a first frequency for driving a logic circuit of an electronic apparatus. The modulating circuit 7 is provided with an integration circuit 2, a second oscillating circuit 2 for generating a second frequency, an integration circuit 4, an adding circuit 5 for synthesizing each output of the integration circuits 2, 4, and a waveform shaping circuit 6. Accordingly, a clock signal outputted from a first oscillating circuit 1 is subjected to phase modulation band width of a higher harmonic of the clock signal is widened and its peak level falls. In such a way, the level of the higher harmonic can be reduced, and as a matter of course, its radiation level can also be reduced.</p> |
