* Question
| How to calculate the equivalent capacitance of the transmission line? |
* Answer
| From the information of the title, two pieces of information can be obtained: (1) This transmission line is a high-speed line. Unless otherwise specified, the default impedance should be 50 ohms;
(2) This transmission line is a stripline structure, designed according to the strip line.Common sense, the transmission delay is about 180ps/in at 50 ohms.Of course, the above derivation result is only an approximation, and the equivalent capacitance of the transmission line per unit length is usually between 3.5 and 3.8 PF.However, in high-speed PCB design, it is often important to remember some common empirical values, sometimes eliminating some cumbersome calculations. |
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