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In the following figure, the transmitter Tx sends a wideband modulated RF signal via a coaxial cable to the receiver Rx. The output impedance ZT of Tx, the characteristic impedance Z0 of the cable, and the input impedance ZR of Rx are all real. Which one of the following statements is TRUE about the distortion of the received signal due to impedance mismatch?

In the following figure, the transmitter Tx sends a wideband modulated RF signal via a coaxial cable to the receiver Rx. The output impedance ZT of Tx, the characteristic impedance Z0 of the cable, and the input impedance ZR of Rx are all real. Which one of the following statements is TRUE about the distortion of the received signal due to impedance mismatch? Correct Answer Signal distortion implies impedance mismatch at both ends: Z<sub>T</sub> ≠ Z<sub>0</sub> and Z<sub>R</sub> ≠ Z<sub>0</sub>

Concept:

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  • For distortion less transmission of signal, there must be perfect impedance matching at both the transmitting and receiving end.
  • If either of Z1 and ZR is matched with Z0, it will cause complete absorption of the signal traveling on the line.
  • So for the distorted signal, we have both conditions ZT ≠ Z0, ZR ≠ Z0

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