Today I Created a basic Colpitts Oscillator Circuit using 2n3904 npn transistor the circuit diagram is given in attachments and when I saw the output I got a Distorted sine wave.I haveu 2,1nF acitors and a1mH inductor as the tank circuit and a 0.1uF c is used to fed back output signal to the base of the transistor. Now the interesting thing is though the output sine Wave is distorted,the input sine Wave looks fine(yellow waveform is input and purple waveform is output) .Please help me getting over this issue and it would be great if someone explains me why this is happening