![]() If the delay time between the signal transmission and reception is short and the signal transmission is faster and if the previous reflected signal was not given time/delay to diminish and next signal is transmitted then this will cause the signal “peaks” to accumulate and will cause reflected signal overshooting thus complete failure of the circuit will happen. The discontinuity in characteristic impedance of signal trace can be caused by variation in signal trace width, thickness, distance between the trace and the corresponding reference plane and dielectric constant of the substrate material of PCB.įortunately, the signal reflected from receiver is always less in strength then the main signal, hence the reflected signal is again transmitted and then again reflected with lesser strength, and hence in this way the signal is diminished slowly but will cause a temporary oscillation. If the characteristic impedance is uniform through starting from source or transmitter to sink or receiver then there will be no signal reflection. The reason for the signal reflection from receiver to the transmitter is the transient impedance caused by the discontinuity in characteristic impedance of signal trace. This reflected signal can cause signal distortion and oscillation in the circuit. The signal reflection is the phenomena where the source transmits the electrical signal in the signal trace to the receiver/sink and some part of the signal is reflected back from receiver/sink back to the source. The same phenomena is with electrical signal. Another example is water, when light enters the water some of the light is refracted while some is reflected. Request PCB Manufacturing & Assembly Quote NowĪs we are familiar with the phenomena of reflection that when a light ray is incident on the mirror then the light is reflected from mirror’s surface.
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