1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Determine the response of the circuit H(s)

  1. May 1, 2010 #1
    http://www.instantfilehosting.com/images/access/number-7427.jpg [Broken]

    i divided the circuit into two halves. i did the first half which is from X(t) till A. i got [(1+Rb/Ra)*1/(R1C1)]/[S+1/(R1C1)] but I'm not sure if i did it right and i don't know how to do the second part. can anyone help me please
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. May 6, 2010 #2


    User Avatar

    A is simply an amplifier. The voltage at the right side is the voltage at the left side multiplied by the gain A.
    The transfer function of the circuit to the right is calculated in the same way you did for the left circuit..
    The role of the amplifier A is to separate the two parts of the circuit, so that the input impedance of the second circuit does not influence the first one.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook