A practical demonstration of selecting series termination resistors for high-speed digital PCB designs. Using a radio control PCB with an STM32H7 microcontroller connected via SPI to a CC2500 RF transceiver, the video walks through measuring clock signal waveforms with an oscilloscope, showing the effects of different drive strength settings and series resistor values (0, 25, 33, 50, 100 ohms) on overshoot, undershoot, and ringing. The 50 ohm resistor is identified as optimal for this design, achieving a critically damped response. The video also covers estimating driver output impedance from the chosen termination value and trace impedance calculations using a microstrip impedance calculator.
•19m watch time