And c ontrary to the Hartley oscillator, its frequency stability is better and reliable. Its operating range is approximately 20KHz to MHz. The capacitors have a series connection, whereas the inductor has a parallel connection to the capacitor series. Its tank circuit comprises an inductor and two capacitors. The Colpitts oscillator is a type of LC oscillator, invented by Scientist Edwin Colpitts in 1918. Often, its operating oscillation frequency ranges from 20KHz to 20MHz, and you can realize it using Op-Amps, FET, and BJT. Further, the inductors have a series connection while the capacitor is parallel to the inductors' series combination. For the tank circuit, he placed one capacitor and two inductors. Ralph Hartley invented the Hartley oscillator in 1915. Then, the secondary coil of the transformer gives the feedback signal. The capacitor and a transformer's primary coil form the tuned circuit. Then, the secondary of the transformer gives a portion of oscillation feedback to the transistor's base.įor the tuned base oscillator, you will find the tuned circuit between the ground and base of the transistor. Also, the capacitor and primary of the transformer form the tank circuit. It has a capacitor and transformer with a parallel connection crossway to the oscillator's collector circuit. Additionally, they are applicable in a wide range of electronic devices such as tuner capacitors and RF signal generators.Ī tuned collector oscillator is the most basic LC oscillator. Other times, they can generate high-frequency signals hence making them RF oscillators. The feedback is important in maintaining a stable oscillation.Īlmost always, you can comprehend an LC oscillator using an active device like Op-Amps, BJT, MOSFETs, or FET. The term LC comes from the tank circuit having an inductor 'L' and capacitor 'C.Īn LC Oscillator is an oscillator type whereby you use an inductor-capacitor (LC) tank circuit to give positive feedback.
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