First of all thanks everybody for the guidance.
I have attached a modified circuit, simulation settings and simulation output. kindly see if the operation seems ok now. I still have one doubt that when I go for viewing the waveform from 1 to 100ms then I see constantly increasing magnitude. Is this normal? Though I have used back to back diode based arrangement, but please help me understand if something is wrong.
@keith-> I am working on a voltage divider bias BJT to acheive the same operation and would share my circuit soon and take your guidance on that.
@FvM-> Your comment gave me an idea and I think the output is kind of acceptable now. The derivation of B =C2/C1, takes into account that current is same in both the feedback path and the output path. in this case the resistor 5K is already there in the inverting path that means to balance this effect i need to put a 5K at the output before I enter the colpitt arrangement just to make sure that the ratio of Vf/vout depends only of C1 and C2.
Theory is attached in my document. Please see the waveform and let me know if something else is required? Is everything ok according to you?
@LvW
What exactly is wrong I didnt get you. One thing I understand is that I need to take output and feed it in inverting input side. this leads to 180 degree shift .The additional 180 degree phase shift require for oscillation is achieved by the fact that the two capacitors are connected together in series but in parallel with the inductive coil resulting in overall phase shift of the circuit being zero or 360 degrees.
I request you to kindly see the new circuit ( i did some modifications but overall its same) and tell me exactly what is wrong. Please see current simulation results and let me know what do you think.
Thanks again for helping me out. i am trying to understand the theory in book by actually doing it on pspice so having a lot of problem. I totally depend upon you guys for advice so please keep helping me. I am now designing the same circuit with BJT and will post it soon.
And yes everybody gets points