DIFFUSION SPECTRUM CLOCK GENERATING DEVICE

摘要: PROBLEM TO BE SOLVED: To reduce the peak of a spectrum by modulating clock pulse train based on reference frequency with setting so as to obtain spread thereby spreading shape an electromagnetic interference(EMI) component into flat shape. SOLUTION: A is generated piezoelectric crystal (Y1) 22 and oscillator circuit 24, divided integer M programmable counter 26 whose N/M synchronously from equivalent PLL consisting phase detection section 30, filter 32 VCO (1) 28 where output interger N. The modulated signal ROM 36 accessed via up-down 40 in response set number 42. Then string EMI reduced harmonics (2) 44 simply without use shield.