i have all components tolerance set to 5% even the 4.7KOhm(which is incorrectly 4.7Ohm, corrected it) and still there is no output. I have done many oscillator simulation and all have so far worked but not this one.I have not examined your circuit in detail, but this is not uncommon when simulating oscillators with ideal components. Usually they require something to "kickstart" the process like an initial condition, a noise source, or parasitic elements. It seems like some circuits want to oscillate and others require more encouragement.
That's a rather dodgy circuit.i am trying to simulate the colpitts oscillator circuit as shown
yes, this is the form of Colpitts oscillator I know, but the one I showed should also work, isn't it? I have seem them in FM transmitter circuit and was wondering whether this is actually the oscillator or not.That's a rather dodgy circuit.
It should definitely have a decoupling cap from base to ground, and, strictly, a cap across the emitter resistor to fit the definition of a Colpitts circuit: Feedback via a capacitive divider.
eg. This is the fundamental config for a common base Colpitts:
At the very least you've left out the capacitor decoupling the base.yes, this is the form of Colpitts oscillator I know, but the one I showed should also work, isn't it? I have seem them in FM transmitter circuit and was wondering whether this is actually the oscillator or not.
resonance frequency with 4.88mH and 2.2nF is 48.60 KHz so does that mean the capacitor 680pF(C1) has no effect?so that means this is not a Colpitts oscillator. what is the function of the capacitor between collector and emitter lik the capacitor C3 we see in many one transistor FM circuits shown below?4mH with 2.2nF should be resonant at 53.65 KHz. That does not allow for the other circuit capacitance.
I simed in Simetrix, the osc starts and dies out. Tried various feedbackthank you, but i want to know whether the circuit i posted works or not