Can someone help me find the closed loop gain

Reply to Thread

Discussion in 'Homework Help' started by ytimk1974, Oct 10, 2013.

Reply to Thread
  1. Oct 10, 2013 #1
    ytimk1974

    Thread Starter New Member

    Oct 4, 2013
    6
    0
    This is a question that I just can't seem to find the answer for in my text:

    Given that open loop critical frequency = 750Hz, the closed loop critical frequency = 5.5kHz, and the A'ol = 89dB, determine the closed loop gain in dB.

    Anybody's help is greatly appreciated.
     
    #1 Reply
  2. Oct 10, 2013 #2
    LvW

    Active Member

    Jun 13, 2013
    674
    100
    Please, can you explain to us the term "critical frequency"?
     
    #2 Reply
  3. Oct 10, 2013 #3
    ytimk1974

    Thread Starter New Member

    Oct 4, 2013
    6
    0
    Well I was hoping someone would understand that because I have been over every formula in this text and can't come up with any formulas that need these specific numbers. I'm sure I am missing something. The definition in the glossary says that it is the frequency that defines the end of the passband filter; also called cutoff frequency.
     
    #3 Reply
  4. Oct 10, 2013 #4
    WBahn

    Moderator

    Mar 31, 2012
    20,069
    5,665
    If the approach you take to learning electronics is to pour over lists of formulas looking for one that needs the specific parameters that you've got, then you are going to have lots of problems.

    What you are missing is comprehension of the material you are studying.

    Try looking up "gain-bandwidth product" and see if it sheds some light.
     
    #4 Reply
    KJ6EAD likes this.
  5. Oct 10, 2013 #5
    ytimk1974

    Thread Starter New Member

    Oct 4, 2013
    6
    0
    Thanks and I agree with you, but I am giving it my all. I just jumped into my first class with this material and I fear I may be to far behind. Thanks for the help
     
    #5 Reply
  6. Oct 10, 2013 #6
    WBahn

    Moderator

    Mar 31, 2012
    20,069
    5,665
    It's very possible that you are, indeed, too far behind. If that's the case, then you will likely be best served in the long run by taking a step back and taking (or retaking) the courses that lead up to this one. This material is foundational; even if you scrape by in this course, you are building a weak foundation and that will come back to haunt you.
     
    #6 Reply
    KJ6EAD likes this.
  7. Oct 10, 2013 #7
    shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,922
    601
    #7 Reply
  8. Oct 10, 2013 #8
    LvW

    Active Member

    Jun 13, 2013
    674
    100
    shteii01, you should better check the contents of a link before posting.

    The given link defines a term "critical frequency" - however, obviously this is NOT the "critical" frequency ytiml1974 has mentioned in his post. (This can easily be seen by comparing the frequencies in the first post).

    My recommendation to ytimk1974: Forget the link and follow the recommendation from WBahn.
    And - yes, your assumption is correct: The frequency called "critical" seems to be the 3-dB corner frequency of both the open and the closed-loop gain, respectively.
     
    Last edited: Oct 10, 2013
    #8 Reply
  9. Oct 16, 2013 #9
    ytimk1974

    Thread Starter New Member

    Oct 4, 2013
    6
    0
    update: Thank you everyone for your advice.

    WBahn, my problem was that I over complicated things as usual thanks for sending me in the right direction Acl*fc(ol) = Aol*fc(ol).
     
    #9 Reply
Loading...
Related Forum Posts:
  1. KaiL

    Find the closed-loop transfer function

    Posted by KaiL in forum: Homework Help
    Replies:
    6
    Views:
    254
  2. student111111

    Please can anyone find for me the Gain?

    Posted by student111111 in forum: Analog & Mixed-Signal Design
    Replies:
    15
    Views:
    616
  3. penny07

    Closed-loop gain of the opamp

    Posted by penny07 in forum: General Electronics Chat
    Replies:
    4
    Views:
    787
  4. pejuron

    Can someone help me?

    Posted by pejuron in forum: Embedded Systems and Microcontrollers
    Replies:
    1
    Views:
    738
  5. ElecNerd

    Can someone help me find the area enclosed by a given curve?

    Posted by ElecNerd in forum: Math
    Replies:
    5
    Views:
    2,454
  6. nkf

    Can someone help me?

    Posted by nkf in forum: The Projects Forum
    Replies:
    9
    Views:
    1,674
You May Also Like:

  1. Switch Bounce and How to Deal with It

  2. Iorek: A Robot that Incorporates Algorithms and Artificial Intelligence into Object Interactions

  3. New Programming Language Tackles Energy Harvesting's Problem with Intermittent Power


Load More