High speed Designs - Part 27 (Voltage and current inserted into the Transmission line)

In high-speed PCB design, understanding how voltage and current are inserted (launched) into a transmission line is critical for signal integrity.

This video explains:

• What voltage is launched into a transmission line

• Role of source impedance and characteristic impedance

• Why the initial voltage is not equal to Vdd

• Transmission line behavior in high-speed designs

• Reflections, impedance matching, and signal settling

• Practical relevance to PCB traces, ASIC/MCU IOs, and drivers

This concept is fundamental for:

High-speed PCB design engineers, signal integrity analysis, DDR, SerDes, and transmission line simulations.

📌 Topics Covered:

Transmission line theory, source impedance, characteristic impedance (Zo), voltage division, reflections, signal integrity, high-speed design basics.

#HighSpeedDesign #SignalIntegrity #TransmissionLine #PCBDesign #VoltageLaunch

Voltage inserted into the transmission line

https://youtu.be/ufM1tXzNRVk

Current inserted into the transmission line

https://youtu.be/mREVjpDg6Hw