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A Colpitts oscillator is an electronic circuit that generates a sinusoidal waveform, typically in the radio frequency range. It uses an inductor and two capacitors in parallel to form a resonant tank circuit, which determines the oscillation frequency.
The Colpitts Oscillator design uses two centre-tapped capacitors in series with a parallel inductor to form its resonance tank circuit producing sinusoidal oscillations. In many ways, the Colpitts oscillator is the exact opposite of the Hartley Oscillator we looked at in the previous tutorial.
A Colpitts Oscillator is a type of LC oscillator. Colpitts oscillators were invented by American engineer Edwin H. Colpitts in 1918. Like other LC oscillators, Colpitts oscillators use a combination of inductors (L) and capacitors (C) to produce an oscillation at a certain frequency.
Colpitts oscillator is a type of oscillator commonly used in radio frequency (RF) applications to generate carrier frequencies for radio transmitters and receivers. They are used in signal generators to produce stable and tunable sinusoidal waveforms for testing and calibration.
Colpitts oscillator was invented by American scientist Edwin Colpitts in 1918. It is another type of sinusoidal LC oscillator and is basically a harmonic oscillator, which has a lot of applications. The Colpitts oscillator can be realized using valves, transistors, FETs or op-amp.
A Colpitts oscillator looks just like the Hartley oscillator but the inductors and capacitors are replaced with each other in the tank circuit. The constructional details and operation of a colpitts oscillator are as discussed below.
The Colpitts oscillator, like the Hartley is capable of giving an excellent sine wave shape, and also has the advantage of better stability at very high frequencies. It can be recognised by always having a "tapped capacitor"