Techhub

Episode 1 - What is Impedance?

This section explains the concept of impedance. The unit of impedance of a capacitor or coil is "Ω", but it does not consume power like a resistor. The meaning of impedance for capacitors and coils will be explained in an easy-to-understand manner.

Episode 2 - What is Characteristic Impedance?

The meaning of characteristic impedance is explained by comparing it to a waterway. Reflected waves are generated when traces with different characteristic Impedances are connected. The mechanism by which reflected waves are generated will be explained in an easy-to-understand manner by comparing it to water flowing in a waterway.

Episode 3 - What is a Transmission Line?

The mechanism by which signals and electric power are transmitted over transmission lines is explained in an easy-to-understand manner by comparing it to water flowing in a waterway. The lecture does not use difficult mathematical formulas, but uses the image of water flowing in a waterway to help the viewer understand transmission lines.

Episode 4 - Characteristic Impedance Measurement Methods

This article provides a detailed explanation of measuring characteristic impedance, including practical examples. It covers reviewing characteristic impedance, measuring it in both the time and frequency domains, and interpreting the measurement results.

Episode 5 - Using TDR (Time Domain Reflectometry) Notes on Characteristic Impedance Measurement

In Episode 4, the discussed topic was the measurement of Characteristic Impedance (Zc), and this time, there will be an explanation of the points to consider when measuring Zc using TDR.

Episode 6 Using TDR (Time Domain Reflectometry) Notes on Characteristic Impedance Measurement Causes of Multiple Reflections (Part 1)

Episode 5 explained the points to note about Characteristic Impedance (ZC) using TDR. Measurement cases where there are several traces with different ZC will be discussed in detail in Episode 7. In this article, the trace with constant ZC is explained in detail in order to provide a better understanding of the principle of TDR measurement.

Episode 7 Using TDR (Time Domain Reflectometry) Notes on Characteristic Impedance Measurement
Causes of Multiple Reflections (Part 2)

In the sixth episode, the principle of measuring characteristic impedance was explained using a lattice diagram.In Episode 7, the reflection waveform in the case of multiple traces with different ZC will be explained using the lattice diagram as in Episode 6.

Episode 8 Using TDR Notes on Characteristic Impedance
Measurement Relationship between Signal Rise Time and Trace Length

In Episode 8, we will learn about the relationship between the rise time of the step pulse signal output from the TDR (Time Domain Reflectometry) measuring instrument and the trace length.

Episode 9 Notes on Characteristic Impedance Measurement Using TDR (Time Domain Reflectometry) - Reflected Waveforms of Printed Circuit Boards (PCBs) with Losses

In Episode 5, we presented a case in which the characteristic impedance (Zc) of a lossy transmission line increased with distance from the TDR signal source, despite the trace width remaining constant. This behavior is caused by the resistive component of the trace. To explain this, we model the lossy trace as a lossless transmission line in series with a resistor.