Colpitts oscillator

[hmic21]

Does anyone know how to simulate a colpitts oscillator on PSpice? I'm modeling the crystal with a cap and an inductor in series and both of them in parrallel with a cap but can't get it to oscillate at all. They told me to kick start it by introducing some noise by adding a VPulse source at the transistor base, but still have no luck. Any help would be greatly appreciated.
Thanks

 

[Warpspeed]

Model the crystal with just a straight inductor. It will resonate with the pair of capacitors between either end and ground, that is how a "normal" LC collpits oscillator is arranged.