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Colpitts generator Pspice

Discussion in 'General Electronics Discussion' started by Arek462, Jun 29, 2016.

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  1. Arek462

    Arek462

    1
    0
    Jun 29, 2016
    Hello!

    I tried simulate Colpitts generator from Horowitz's book:

    colpitts.png

    There isn't crystal in pspice student version so i replaced it with rlc circuit and also added 1G resistor because of the "floating point":

    colpitts_schematic.png

    Howewer the waveforms doesn't look like i expected:

    colpitts_simulation.png


    If any expert could help me, i will be very grateful.

    Thank you!
     
  2. Alec_t

    Alec_t

    2,926
    796
    Jul 7, 2015
    C3 is 1000p in the schematic, but only 100p in the sim. Is that intentional?
     
  3. LvW

    LvW

    604
    146
    Apr 12, 2014
    The used FET needs a negative bias voltage VGS - hence, a small source resistor would help.
    Mote than that - the crystal must be replaced by an inductance only.
     
    Last edited: Jun 29, 2016
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