Colpitts Oscillator Mosfet. Colpitts oscillator is an electronic oscillator which uses an inductor and capacitors to form an lc oscillator circuit. If in the basic circuit of colpitts oscillator the fet is used as an active device in the amplifier stage the circuit is called as fet colpitts oscillator.
The two capacitors c1 and c2 are placed across a single common inductor l as shown. Clapp oscillator is a type of colpitts oscillator. The practical circuit of fet colpitts oscillator is shown in the figure.
The tank circuit remains same as before.
Oscillation frequency depends on tank circuit resonant frequency. The locations of the complex conjugate poles depicting starting and steady state conditions for oscillations are also presented. A colpitts oscillator invented in 1918 by american engineer edwin h. The steady state output voltages calculated from.
