LT Spice Colpitt Oscillator

Discussion in 'Homework Help' started by Runs212, Apr 15, 2015.

  1. Runs212

    Thread Starter Member

    Mar 12, 2015
    55
    1
    I designed a colpitt oscillator on LT Spice whose output is suppoed to be 1MHz. However, When i run the simulation, it outputs a DC voltage instead of a sin wave. Could you please look into to tell me if I'm doing it correctly and how to generate the sine wave. I have attached the LT SPice file for your convenience. Thanks.
    upload_2015-4-15_19-26-38.png
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    For starters, put a real transistor in. Add the STARTUP directive to the the .TRAN command.
     
  3. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Look at the value of R1 - does it make sense that the circuit will function as expected with that value of R1?
     
  4. ScottWang

    Moderator

    Aug 23, 2012
    4,850
    767
    I haven't try this in breadboard, but through changed the values of resistor and set the bjt number, and it works.

    The same circuit is here.
     
  5. Runs212

    Thread Starter Member

    Mar 12, 2015
    55
    1
    Thanks very much everyone. Your comments were very helpful.
     
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