Colpitt Oscillator

Discussion in 'General Electronics Chat' started by silv3r.m00n, Apr 19, 2010.

  1. silv3r.m00n

    Thread Starter New Member

    Apr 15, 2010
    14
    0
    Hi

    Colpitt oscillator

    [​IMG]

    Spice Code :
    Code ( (Unknown Language)):
    1.  
    2. Colpitt Oscillator
    3. * colpitt_oscillator.cir
    4.  
    5. v1 1 0 dc 6
    6. r1 1 2 10K
    7. r2 2 0 10K
    8. c3 2 0 .1e-6
    9. l1 1 3 .15e-6
    10. r3 4 0 2.2K
    11. c1 3 4 100e-12
    12. c2 4 0 100e-12
    13. q1 3 2 4 2n2222
    14.  
    15. .model 2n2222 npn (is=19f bf=150 vaf=100 ikf=0.18 ise=50p
    16. + ne=2.5 br=7.5 var=6.4 ikr=12m isc=8.7p nc=1.2 rb=50 re=0.4
    17. + rc=0.3 cje=26p tf=0.5n cjc=11p tr=7n xtb=1.5 kf=0.032f af=1)
    18.  
    19. .tran 2e-9 30e-9 uic
    20. .plot tran v(3) v(2) v(4)
    21. .end
    22.  
    Questions :

    1. Spice shows v(2) = 0 . Why ? It is supposed to be 3V
    2. Oscillations are there even if q1 transistor line is commented/removed. How come ?

    Thanks
    Silver
     
  2. chiques

    New Member

    Feb 18, 2011
    2
    0
    I know this thread is over 2 years old but did you ever get this to work on a bread board?
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Welcome to AAC.

    Congratulations, you have practiced the arcane art of necromancy, the revival of a long dead thread. Likely the OP (Original Poster) has solved his problem in the years that has passed, or thrown it away, or something, never to return.

    My suggestion is to start a thread of your own.
     
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