| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a digital DC component control circuit which controls a DC component without increasing the number of bits of a system signal to be controlled and which does not output an unnecessary frequency component. <P>SOLUTION: The digital DC component control circuit includes a PWM circuit 109 which outputs PWM data by low-order m bits of a DC component control value of (n+m) bits, a first m bit counter 113 for generating a signal for selecting the bit of the PWM data, an M sequence code generating circuit 111 for changing an initial value of this counter to random, a second m bit counter 110 for generating timing, etc. for operating this circuit, a selector 116 for selecting the bit from the PWM data to output a PWM signal, a first adder 117 for adding the PWM signal outputted from the selector to the high-order n bits of the DC component control value to obtain an n-bit DC component control value, an n-bit digital input signal, and a second adder 118 for adding the n-bit digital input signal to the n-bit DC component control value. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
