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What is a terminating resistor ? What is the function of the terminating resistor ?

What is a terminating resistor  ?   What is the function of the terminating resistor  ? 


The terminating resistor is a resistor connected in parallel to a pair of communication lines at both ends of the line network.


According to transmission line theory, terminating resistors can absorb reflected waves on the network, effectively enhancing signal strength.


The value of the two terminating resistors in parallel should be substantially equal to the characteristic impedance of the transmission line at the communication frequency.


1. What is the terminating resistor ?


Termination resistance is an obstacle encountered in the transmission process of electronic information.


When high-frequency signals are transmitted, the signal wavelength is shorter than that of the transmission line, and the signal will form a reflected wave at the end of the transmission line, which will interfere with the original signal. Therefore, it is necessary to add a terminal resistance at the end of the transmission line so that the signal does not reflect after reaching the end of the transmission line.


Not for low frequency signals. In long-line signal transmission, in order to avoid signal reflection and echo, it is also necessary to connect a terminal matching resistor at the receiving end.


2. What is the function of the terminating resistor ?


1. General statement: The terminal resistance is to weaken the signal reflection in the communication cable.


2. Signal transmission circuit Because various transmission lines have their characteristic impedance, Twisted Pair Cable is 120Ω.


When the signal is transmitted to the terminal in the transmission line, if its terminal impedance and characteristic impedance are different, it will cause reflection and distort the signal waveform


The distortion phenomenon is not obvious when the transmission line is short, but it will become more serious as the transmission line is lengthened, resulting in incorrect transmission. At this time, a terminating resistor must be installed.


Premier Cable CO LTD, , is a cable factory based in China, we mainly make CAN Termination resistors, plugs and cables , IOT related cables


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CAN-T Adapter

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