Circuit structure and circuit substrate for modifying charcteristic impedance by using different reference planes

摘要

A circuit structure for modifying characteristic impedance by using different reference planes is provided. The structure comprises an analog signal line, a digital signal line, a reference plane for analog signals and a reference plane for digital signals. Wherein, the line width of the analog signal line is the same as that of the digital signal line. In addition, the distance between the analog signal line and the analog signal reference plane is longer than the distance between the digital signal line and the digital signal reference plane. Accordingly, the characteristic impedance mismatch during signal transmission can be solved and the quality of signal transmission can be improved.