| 摘要 |
PROBLEM TO BE SOLVED: To effectively remove noise even if common mode noise is superimposed on an input bit-added voltage.SOLUTION: A clock signal CLK of a duty of 50% on which common mode noise is superimposed and which repeats 1, 0, 1, 0 in synchronism with bit signals is input into a high pass filter 14 and a low pass filter 16, and the common mode noise and a shift voltage V2 are produced. A common mode noise cancellation voltage V3 is generated on the basis of the common mode noise and the shift voltage and is superimposed on the shift voltage V2 to produce a reference voltage Vref. |
