Everything about Colpitts Oscillator totally explained
A
Colpitts oscillator, named after its inventor
Edwin H. Colpitts, is one of a number of designs for
electronic oscillator circuits. One of the key features of this type of oscillator is its simplicity and robustness. It isn't difficult to achieve satisfactory results with little effort.
A Colpitts oscillator is the electrical dual of a
Hartley oscillator. In the Colpitts circuit, two
capacitors and one
inductor determine the
frequency of oscillation. The
feedback needed for oscillation is taken from a
voltage divider made by the two capacitors, where in the Hartley circuit the feedback is taken from a voltage divider made by two inductors (or a tapped single inductor). (Note: the capacitor can be a variable device by using a
varactor).
Figures 1-3 show simple examples of
bipolar junction transistor based Colpitts oscillators. The BJTs can be replaced with any active device, such as a
JFET or a
MOSFET, capable of producing gain at the oscillation frequency.
Theory
Oscillation frequency
The ideal frequency of oscillation for the circuits in Figures 1 and 2 are given by the equation:
»
In the Hartley circuit, oscillation is more likely for larger values of transconductance and/or larger values of inductance.
Oscillation amplitude
The amplitude of oscillation is generally difficult to find, but it can often be accurately estimated using the
describing function method.
Further Information
Get more info on 'Colpitts Oscillator'.
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