Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Impedence Matching

  1. Feb 10, 2009 #1
    1. The problem statement, all variables and given/known data
    Two meters of cable of inductance per unit length 0.169 microH/ft and 30.0 pF/ft are connected in between a pulse generator with a 175 ohm output impedance and a pulse counter with 1 Kohm input impedance. If the output of the generator is a single 5V pulse of duration 0.1ns, what is the amplitude of the pulse when it reaches the detector? What is the amplitude of the voltage amplitude of the reflected pulse when it reaches the detector for the first time? The second time? If the pulse counter can count pulses which have a voltage amplitude between 0.3 and 0.7 V, how many pulses will the detector count?

    How would you solve the reflection problem caused by mismatched impedances above?

    2. Relevant equations

    A(ref) = A(inc)(Z-Z0)/(Z+Z0)

    3. The attempt at a solution

    Using above mentioned equation i got 2V as reflected amplitude.

    But i am sure how to proceed after that. I am not clear with question being asked.

    Thanx for reading
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?