Colpitts oscillator using operational amp

[scorpionss22]

colpitts op amp oscillator

hi all
ineed Colpitts oscillator using operational amp
and how can i find its gain and feedback gain
thanks for cooperation

 

[abhigopal]

colpitt oscillator using op amp

for finding gain , just find voltage gain of the op amp first, which is say A. then find the K which is the feedback ratio from the feedback network. Gain is given by G= A/(1+KA).... the circuit is similar to colpitt with BJT.. just put the feedbacknetwork innegative feedback with the op-amp.

 

[strabush]

colpitts oscillator amp op

After some search I finally found the direct link to the article:
**broken link removed**

 

[scorpionss22]

colpitts oscillator, op amp

i need to analyise this circuit below
i need the equetion of the gain from feed back and for the amplifire
included the internal resistor of the operational amplifire(out put resistor )

 

[scorpionss22]

colpitts oscillator op amp

hello any one help me to solve this circuit

 

[R00KIE]

If i've done everything rigth:

A=(s^3*R*L*C2+s*R)*C1+(s^2*L+s*R)*C2+1

and the gain of the feedback should be

1/((s^3*R*L*C2+s*R)*C1+(s^2*L+s*R)*C2+1)

but don't trust this too much until someone else checks this result