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Definition of "Colpitts Oscillator" |
An LC oscillator. An oscillator that generates a sine-wave using a feedback loop comprised of a parallel LC circuit. The feedback is taken from the connection of two series capacitors that are used to form a voltage divider and which also matches the output impedance of the 3-terminal active device. An example transistor Colpitts Oscillator is shown to the right. The Frequency of oscillation is; Fo = 1 / (2 x 3.14 x (L1 x [(C1 x C2) / (C1 + C2)]1/2). / A Colpitts oscillator, invented in 1918 by American engineer Edwin H. Colpitts, is one of a number of designs for LC oscillators, electronic oscillators that use a combination of inductors and capacitors to produce an oscillation at a certain frequency. The distinguishing feature of the Colpitts oscillator is that the feedback for the active device is taken from a voltage divider made of two capacitors in series across the inductor. / Metal-Oxide Semiconductor Field-Effect transistor structure is obtained by growing a layer of SiO2 on top of a silicon substrate and depositing a layer of metal or polycrystalline silicon the latter is commonly used. As the silicon dioxide is a dielectric material, its structure is equivalent to a planar capacitor, with one of the electrodes replaced by a semiconductor. / an oscillator with a pair of tapped capacitors in the feedback network. |
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