![]() Let’s talk through a source termination example in more detail. If the load resistance is relatively high, which it is for most digital circuits, then R T = Z 0. Load termination involves placing a resistor in parallel (between signal and ground) with value such that the parallel combination of the termination resistor and load resistance equals the characteristic impedance of the transmission line. If R S is small, then R T = Z 0 Load Termination: Add parallel resistor at receiver. Source Termination: Add series resistor at driver. Source termination stops waves travelling at the source from reflecting back at the receiver by adding a series resistor that when added to the source resistance equals the characteristic impedance of the transmission line. There are two main types of termination, source (driver) termination and load (receiver) termination. You need to mitigate and control reflections in a digital transmission line, and you can do this by implementing what is called termination. Electrical Engineering educational websiteįor a digital signal, a conductor exhibits transmission line effects such as reflections when the length of the conductor is at least 1/6 the distance that a rising/falling edge occupies when propagating.
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